Added the open and close time in the disk/non-disk time ratio calculation in disk tasks (close is the most important).

Updated the example castor.conf accordingly.
Removed reference to now gone repackd in castor.conf example.
Removed unused entried in rtcp_constants.h and replaced rtcpd_constants.h by constants in tapeserver/daemon/Constants.hpp.

Added better measurement of the disk performance to locate slow disk servers during tests in production.

Fixed creating the wrong type of DiskWriteFile when we have non-xroot mode and non-URL path.

This unfortunate move is necessary because the error/exception
handling of rmcd is done using the TCP/IP connection with the
client.

The following two log snippets show that after retrying a mount
several times and finally succeeding, there is still the error
"rmc_sendrep: RMC02 - send error : No such file or directory".
This commit adds more logs to try an determine what is happening.

tpsrv001
========

10/24 14:16:54  6638 dispatch: Dispatching request handler: req_type=4 req_type_str=RMC_MOUNT attemptNb=1 maxNbAttempts=3
10/24 14:16:54  6638 rmc_srv_mount: RMC92 - mount request by 14029,1474 from tpsrv001.cern.ch
10/24 14:16:54  6638 rmc_srv_mount: RMC98 - mount I07700/0 on drive 1
10/24 14:16:55  6638 lasterror: Function entered: asc=40 ascq=1 save_errno=5 rc=-4 sensekey=6 skvalid=1
10/24 14:16:55  6638 lasterror: Entry found in scsierr_acttbl: action_str=RBT_FAST_RETRY
10/24 14:16:55  6638 rmc_sendrep: smc_mount: SR017 - find_cartridge I07700 failed : Import or Export Element Accessed
10/24 14:16:55  6638 rmc_srv_mount: returns 2205
10/24 14:16:55  6638 dispatch: Sleeping before fast retry: delayInSec=1 req_type=4 req_type_str=RMC_MOUNT attemptNb=2 maxNbAttempts=3
10/24 14:16:56  6638 dispatch: Dispatching request handler: req_type=4 req_type_str=RMC_MOUNT attemptNb=2 maxNbAttempts=3
10/24 14:16:56  6638 rmc_srv_mount: RMC92 - mount request by 14029,1474 from tpsrv001.cern.ch
10/24 14:16:56  6638 rmc_srv_mount: RMC98 - mount I07700/0 on drive 1
10/24 14:16:56  6638 lasterror: Function entered: asc=40 ascq=0 save_errno=5 rc=-4 sensekey=6 skvalid=1
10/24 14:16:56  6638 lasterror: Entry found in scsierr_acttbl: action_str=RBT_FAST_RETRY
10/24 14:16:56  6638 rmc_sendrep: smc_mount: SR017 - find_cartridge I07700 failed : Not Ready to Ready Transition
10/24 14:16:56  6638 rmc_srv_mount: returns 2205
10/24 14:16:56  6638 dispatch: Sleeping before fast retry: delayInSec=1 req_type=4 req_type_str=RMC_MOUNT attemptNb=3 maxNbAttempts=3
10/24 14:16:57  6638 dispatch: Dispatching request handler: req_type=4 req_type_str=RMC_MOUNT attemptNb=3 maxNbAttempts=3
10/24 14:16:57  6638 rmc_srv_mount: RMC92 - mount request by 14029,1474 from tpsrv001.cern.ch
10/24 14:16:57  6638 rmc_srv_mount: RMC98 - mount I07700/0 on drive 1
10/24 14:17:09  6638 rmc_srv_mount: returns 0
10/24 14:17:09  6638 rmc_sendrep: RMC02 - send error : No such file or directory

tpsrv007
========

10/24 14:17:14  8152 dispatch: Dispatching request handler: req_type=4 req_type_str=RMC_MOUNT attemptNb=1 maxNbAttempts=3
10/24 14:17:14  8152 rmc_srv_mount: RMC92 - mount request by 14029,1474 from tpsrv007.cern.ch
10/24 14:17:14  8152 rmc_srv_mount: RMC98 - mount I20497/0 on drive 11
10/24 14:17:14  8152 lasterror: Function entered: asc=41 ascq=0 save_errno=5 rc=-4 sensekey=6 skvalid=1
10/24 14:17:14  8152 lasterror: Entry found in scsierr_acttbl: action_str=RBT_FAST_RETRY
10/24 14:17:14  8152 rmc_sendrep: smc_mount: SR017 - find_cartridge I20497 failed : Power On, Reset, or Bus Device Reset Occurred
10/24 14:17:14  8152 rmc_srv_mount: returns 2205
10/24 14:17:14  8152 dispatch: Sleeping before fast retry: delayInSec=1 req_type=4 req_type_str=RMC_MOUNT attemptNb=2 maxNbAttempts=3
10/24 14:17:15  8152 dispatch: Dispatching request handler: req_type=4 req_type_str=RMC_MOUNT attemptNb=2 maxNbAttempts=3
10/24 14:17:15  8152 rmc_srv_mount: RMC92 - mount request by 14029,1474 from tpsrv007.cern.ch
10/24 14:17:15  8152 rmc_srv_mount: RMC98 - mount I20497/0 on drive 11
10/24 14:17:15  8152 lasterror: Function entered: asc=40 ascq=0 save_errno=5 rc=-4 sensekey=6 skvalid=1
10/24 14:17:15  8152 lasterror: Entry found in scsierr_acttbl: action_str=RBT_FAST_RETRY
10/24 14:17:15  8152 rmc_sendrep: smc_mount: SR017 - find_cartridge I20497 failed : Not Ready to Ready Transition
10/24 14:17:15  8152 rmc_srv_mount: returns 2205
10/24 14:17:15  8152 dispatch: Sleeping before fast retry: delayInSec=1 req_type=4 req_type_str=RMC_MOUNT attemptNb=3 maxNbAttempts=3
10/24 14:17:16  8152 dispatch: Dispatching request handler: req_type=4 req_type_str=RMC_MOUNT attemptNb=3 maxNbAttempts=3
10/24 14:17:16  8152 rmc_srv_mount: RMC92 - mount request by 14029,1474 from tpsrv007.cern.ch
10/24 14:17:16  8152 rmc_srv_mount: RMC98 - mount I20497/0 on drive 11
10/24 14:17:25  8152 rmc_srv_mount: returns 0
10/24 14:17:25  8152 rmc_sendrep: RMC02 - send error : No such file or directory

Done.

The offending message has been changed in a previous case: CASTOR-4749

Reviewed all bandwidth calculations to homogenize the statistics printing.
Fixed a bug where the total time for a session was not properly retrieved before logging, leading to NaN printouts.

This reverts commit 97bd05cb.