Implemented cta-admin version command

.gitlab-ci.yml

cmake/CTAVersions.cmake

cmdline/CtaAdminCmd.cpp

cmdline/CtaAdminCmd.hpp

cmdline/CtaAdminCmdParse.hpp

cmdline/CtaAdminTextFormatter.cpp

cmdline/CtaAdminTextFormatter.hpp

common/utils/utils.hpp

continuousintegration/orchestration/tests/prepare_tests.sh

rdbms/Login.cpp

rdbms/Login.hpp

rdbms/LoginTest.cpp

version.hpp.in

xroot_plugins/Versions.hpp

xroot_plugins/XrdCtaVersion.hpp

xroot_plugins/XrdSsiCtaRequestMessage.cpp

xroot_plugins/XrdSsiCtaRequestMessage.hpp

xroot_plugins/XrdSsiCtaServiceProvider.cpp

xroot_plugins/XrdSsiCtaServiceProvider.hpp

xrootd-ssi-protobuf-interface