added a /CANSTART file so that eos waits for all keys to be OK before starting.
/bin/sh -> /bin/bash to allow function names with `-`...
yum and yum-config-manager overridden when in BUILDTREE environment
ctafrontend not booting needs further work

First version of a streaming "cta archivefile ls" command.

when I modified it to read results back in a
"read until end of file" loop.

The bug was that instead of trying to read 1 KiB chunks of data
from the cta front-end, the chunk size was only 8 bytes (the size
of 64-bit pointer).  The calculation of the chunk size was
incorrectly:

   sizeof(buf - 1)

instead of:

   sizeof(buf) - 1

This branch is a workaround as buildtree runner does not work in master.

Typicaly updated every few seconds.

Fixed the timings so they show up in all states.
Removed lds command.
Added error message when a drive is not found for single drive ls.

This led to VID being marked as available during unmount, and another drive could try an mount the same tape.
Added various logs.

The following sequence was observed in tests (with a sleep(3) at the end of MigrationReportPacker::ReportDriveStatus::execute() ):
 [eric@localhost ~]$ date; kubectl -n cta exec ctacli -- cta dr ls VDSTK11
Thu Jun 22 11:19:10 CEST 2017
    drive   host  library  mountType    status  desiredUp  forceDown     vid
  VDSTK11  tpsrv  VLSTK10    Archive  Mounting         UP             V01001
[eric@localhost ~]$ date; kubectl -n cta exec ctacli -- cta dr ls VDSTK11
Thu Jun 22 11:19:12 CEST 2017
    drive   host  library  mountType       status  desiredUp  forceDown     vid
  VDSTK11  tpsrv  VLSTK10    Archive  Transfering         UP             V01001
[eric@localhost ~]$ date; kubectl -n cta exec ctacli -- cta dr ls VDSTK11
Thu Jun 22 11:19:16 CEST 2017
    drive   host  library  mountType      status  desiredUp  forceDown     vid
  VDSTK11  tpsrv  VLSTK10    Archive  CleaningUp         UP             V01001
[eric@localhost ~]$ date; kubectl -n cta exec ctacli -- cta dr ls VDSTK11
Thu Jun 22 11:19:18 CEST 2017
    drive   host  library  mountType     status  desiredUp  forceDown     vid
  VDSTK11  tpsrv  VLSTK10    Archive  Unloading         UP             V01001
[eric@localhost ~]$ date; kubectl -n cta exec ctacli -- cta dr ls VDSTK11
Thu Jun 22 11:19:22 CEST 2017
    drive   host  library  mountType      status  desiredUp  forceDown     vid
  VDSTK11  tpsrv  VLSTK10    Archive  Unmounting         UP             V01001
[eric@localhost ~]$ date; kubectl -n cta exec ctacli -- cta dr ls VDSTK11
Thu Jun 22 11:19:25 CEST 2017
    drive   host  library  mountType  status  desiredUp  forceDown  vid
  VDSTK11  tpsrv  VLSTK10    NoMount      Up         UP               -

Also added extra logs in ArchiveMount::getNextJobBatch().

This was implemented using the previously created Helpers.

This required to pass an AgentReference through to all garbageCollect() member functions of all objects.
The changed behavior required adaptation of the corresponding unit test (the archive queues now need to
be properly referenced in the root entry).

This field had a meaning when tapepools where stored in the objectstore and the archive queue a static object.
Since the introduction of the catalogue, they are now transient objects and storing their address
is not meaninful anymore.

Factored a first function out of OStoreDB into Herlpers.

Failing to report a migration is non-fatal, as succesfully written files can still be reported afterwards.
synchronousReportEndWithErrors had to be rewritten as instanciating and calling a report would have created a race condition.

The demangling has been ported in other places where RTTI was also used.

Fixed closing file descriptor -1 for lock some (legitimate) error cases of BackendVFS::ScopedLock().

Adapted unit tests to validate this fetching.