Use nosetests and xenv from LHCb installation in CI jobs

ci-utils/env_setup.sh

@@ -12,14 +12,15 @@
 : ${CLANG_FORMAT_VERSION:=3.9}
 : ${CCACHE_VERSION:=3.3.4-e92e5}
 
-
 # initial required environment
-export PATH=${LCG_contrib}/CMake/3.11.1/Linux-x86_64/bin:${LCG_contrib}/ninja/1.7.2.gcc0ea.kitware.dyndep-1/x86_64-slc6:${LCG_release_area}/Python/2.7.13-597a5/${BINARY_TAG}/bin${PATH:+:$PATH}
-export PATH=/cvmfs/lhcb.cern.ch/lib/bin/x86_64-centos7:${PATH}
+# - get Python, nosetests and xenv from LHCb installation
+source /cvmfs/lhcb.cern.ch/lib/var/lib/LbEnv/prod/${LCG_hostos}/bin/activate
+# - add CMake ann Ninja-build
+export PATH=${LCG_contrib}/CMake/3.11.1/Linux-x86_64/bin:${LCG_contrib}/ninja/1.7.2.gcc0ea.kitware.dyndep-1/x86_64-slc6:${PATH}
+# - use LHCb compiler wrappers
+export PATH=/cvmfs/lhcb.cern.ch/lib/bin/${LCG_hostos}:${PATH}
+# - enable optional VTune based profiler
 export CMAKE_PREFIX_PATH=${LCG_release_area}:/cvmfs/projects.cern.ch/intelsw/psxe/linux/x86_64/2017/vtune_amplifier_xe
-export CCACHE_DIR=${PWD}/.ccache
 
-# special environment required for LCG binutils
-export PATH=${LCG_contrib}/bintuils/2.28/${LCG_hostos}/bin:${PATH}
-export LD_LIBRARY_PATH=${LCG_contrib}/bintuils/2.28/${LCG_hostos}/lib${LD_LIBRARY_PATH:+:$LD_LIBRARY_PATH}
+export CCACHE_DIR=${PWD}/.ccache
 unset CMTCONFIG