Add wrapper for software collections

The TSC decided to move to devtoolset-7 on rhel7 to allow for C++14
standard code in mantid.

buildconfig/Jenkins/buildscript

@@ -66,6 +66,13 @@ else
   BUILD_CONFIG="Release"
 fi
 
+# Setup software collections on rhel7 to allow using gcc7
+if [[ $ON_RHEL7 ]]; then
+  SCL_ENABLE="scl enable devtoolset-7"
+else
+  SCL_ENABLE="eval"
+fi
+
 # For pull requests decide on what to build based on changeset and Jenkins
 # parameters.
 DO_BUILD_CODE=true
@@ -270,7 +277,7 @@ rm -f -- *.dmg *.rpm *.deb *.tar.gz *.tar.xz
 ###############################################################################
 # CMake configuration
 ###############################################################################
-${CMAKE_EXE} ${CMAKE_GENERATOR} -DCMAKE_BUILD_TYPE=${BUILD_CONFIG} -DENABLE_CPACK=ON -DMAKE_VATES=ON -DParaView_DIR=${PARAVIEW_DIR} -DMANTID_DATA_STORE=${MANTID_DATA_STORE} -DDOCS_HTML=ON -DENABLE_CONDA=ON -DENABLE_WORKBENCH=ON -DENABLE_FILE_LOGGING=OFF ${DIST_FLAGS} ${PACKAGINGVARS} ${CLANGTIDYVAR} ..
+$SCL_ENABLE "${CMAKE_EXE} ${CMAKE_GENERATOR} -DCMAKE_BUILD_TYPE=${BUILD_CONFIG} -DENABLE_CPACK=ON -DMAKE_VATES=ON -DParaView_DIR=${PARAVIEW_DIR} -DMANTID_DATA_STORE=${MANTID_DATA_STORE} -DDOCS_HTML=ON -DENABLE_CONDA=ON -DENABLE_WORKBENCH=ON -DENABLE_FILE_LOGGING=OFF ${DIST_FLAGS} ${PACKAGINGVARS} ${CLANGTIDYVAR} .."
 
 ###############################################################################
 # Coverity build should exit early

buildconfig/Jenkins/pylint-buildscript

@@ -86,7 +86,17 @@ fi
 # Need this because some strange control sequences when using default TERM=xterm
 export TERM="linux"
 PYLINT_FORMAT="parseable"
-${CMAKE_EXE} ${CMAKE_GENERATOR} -DCMAKE_BUILD_TYPE=${BUILD_CONFIG} -DENABLE_CPACK=OFF -DMAKE_VATES=OFF -DPYLINT_MSG_TEMPLATE=\"${PYLINT_FORMAT}\" -DPYLINT_NTHREADS=${BUILD_THREADS:?} -DPYLINT_OUTPUT_DIR=${PYLINT_OUTPUT_DIR} ..
+
+###############################################################################
+# Configure cmake
+###############################################################################
+# Setup software collections on rhel7 to allow using gcc7
+if [[ ${NODE_LABELS} == *rhel7* ]] || [[ ${NODE_LABELS} == *centos7* ]] || [[ ${NODE_LABELS} == *scilin7* ]]; then
+  SCL_ENABLE="scl enable devtoolset-7"
+else
+  SCL_ENABLE="eval"
+fi
+$SCL_ENABLE "${CMAKE_EXE} ${CMAKE_GENERATOR} -DCMAKE_BUILD_TYPE=${BUILD_CONFIG} -DENABLE_CPACK=OFF -DMAKE_VATES=OFF -DPYLINT_MSG_TEMPLATE=\"${PYLINT_FORMAT}\" -DPYLINT_NTHREADS=${BUILD_THREADS:?} -DPYLINT_OUTPUT_DIR=${PYLINT_OUTPUT_DIR} .."
 
 ###############################################################################
 # Build step (we only need the framework)