Merge branch 'migration_ci_tests' of https://gitlab.cern.ch:8443/cta/CTA into migration_ci_tests

Conflicts:
	continuousintegration/docker/ctafrontend/cc7/etc/yum/pluginconf.d/versionlock.list
	migration/gRPC/CMakeLists.txt
	migration/gRPC/EosImportDirs.cpp
	migration/gRPC/EosImportDirs.hpp
	migration/gRPC/EosImportDirsCmd.cpp
	migration/gRPC/EosImportFiles.cpp
	migration/gRPC/GrpcClient.cpp
	migration/gRPC/GrpcClient.hpp
	migration/gRPC/GrpcUtils.cpp