cta/CTA#877 ObjectStore.RetrieveQueueAlgorithms unit tests fails or succeeds base on version of cmake

As suggested by Michal I've added the missing declaration of the
full specialised getElementSummary() method.  This fixes the
problem.  Where there were two "defined" symbols now there is
only one:

[itctabuild02] CTA (master) > nm /lib64/libctaobjectstoreunittests.so.0 | grep _ZN3cta11objectstore15ContainerTraitsINS0_13RetrieveQueueENS0_23RetrieveQueueToTransferEE17getElementSummaryERKNS4_13PoppedElementE
                 U _ZN3cta11objectstore15ContainerTraitsINS0_13RetrieveQueueENS0_23RetrieveQueueToTransferEE17getElementSummaryERKNS4_13PoppedElementE
[itctabuild02] CTA (master) > nm /lib64/libctaobjectstore.so.0 | grep _ZN3cta11objectstore15ContainerTraitsINS0_13RetrieveQueueENS0_23RetrieveQueueToTransferEE17getElementSummaryERKNS4_13PoppedElementE
000000000047afa8 T _ZN3cta11objectstore15ContainerTraitsINS0_13RetrieveQueueENS0_23RetrieveQueueToTransferEE17getElementSummaryERKNS4_13PoppedElementE
[itctabuild02] CTA (master) >

#881 cta-fst-gcd logs can be now sent to stdout by command line option for container based deployments

Updated ImmutableFileTest.cpp in order to handle the fact that kXR_ChkLenErr has been removed in XRootD 5

Updated ImmutableFileTest.cpp in order to handle the fact that XrdCl::OpenFlags::Append has been removed in XRootD 5 as requested by CTA

CMake Warning (dev) at
/usr/share/cmake3/Modules/FindPackageHandleStandardArgs.cmake:272
(message):
  The package name passed to `find_package_handle_standard_args` (gRPC)
does
  not match the name of the calling package (GRPC).  This can lead to
  problems in calling code that expects `find_package` result variables
  (e.g., `_FOUND`) to follow a certain pattern.
Call Stack (most recent call first):
  cmake/FindGRPC.cmake:125 (FIND_PACKAGE_HANDLE_STANDARD_ARGS)
  eos_cta/CMakeLists.txt:19 (find_package)
This warning is for project developers.  Use -Wno-dev to suppress it.

[objectstore] Fixed cta/CTA#875 gtest cannot safely print ContainerTraits<ArchiveQueue,ArchiveQueueToTransferForUser>::PoppedElementsSummary

[cmake] Fixed cta/CTA#872 Fix naming convention bug in CTA/cmake/Findxrootdclient.cmake found by cmake3

Implements "cta-admin failedrequest rm"

See merge request cta/CTA!8

Also deletes all unused options which were defined for commands that
no longer exist

Information is not a countable noun in English (it can't be plural).

Here is an example:
```
[itctabuild02] ~ (krb5=ctaadmin1)> cta-admin tapepool add --name steve --vo vo_1 --partialtapesnumber 1 --encrypted false --comment "Steve's tape pool"
[itctabuild02] ~ (krb5=ctaadmin1)> cta-admin archiveroute add --storageclass single_1 --copynb 1 --tapepool steve --comment "Steve's archive route"
[itctabuild02] ~ (krb5=ctaadmin1)> cta-admin tapepool rm --name steve
Cannot delete tape-pool steve because it is used in an archive route
[itctabuild02] ~ (krb5=ctaadmin1)>
```

Fixed cta/CTA#863 Prevent SQLite database files from being used as the CTA catalogue database backend