Moved images to new dockerhub repo, to permanently add the pre build packages

.gitlab-ci.yml

-before_script:
-    #pre-installation script
-    - yum install which make glibc-devel openmotif-devel mesa-libGLU-devel expat-devel -y
-
 slc6-gcc48:
   tags:
     - docker
-  image: cern/slc6-base
+  image: clicdp/slc6-base
   script:
     - source .gitlab-ci.d/init_x86_64-slc6-gcc48-opt.sh
     - mkdir build 
     - cd build
     - cmake -D DD4HEP_USE_GEANT4=ON -D DD4HEP_USE_BOOST=ON -DBoost_NO_BOOST_CMAKE=ON -D DD4HEP_USE_LCIO=ON -D BUILD_TESTING=ON -DCLHEP_DIR=$CLHEP -D Geant4_DIR=$G4INSTALL/lib64/Geant4-10.2.0 -D DD4HEP_USE_CXX11=ON ..        
     - make -j2
-    - make test
     - make install
+    - make test    
     - cd ../examples
     - mkdir build
     - cd build
@@ -25,15 +21,15 @@ slc6-gcc48:
 slc6-gcc49:
   tags:
     - docker
-  image: cern/slc6-base
+  image: clicdp/slc6-base
   script:
     - source .gitlab-ci.d/init_x86_64-slc6-gcc49-opt.sh
     - mkdir build 
     - cd build
     - cmake -D DD4HEP_USE_GEANT4=ON -D DD4HEP_USE_BOOST=ON -DBoost_NO_BOOST_CMAKE=ON -D DD4HEP_USE_LCIO=ON -D BUILD_TESTING=ON -DCLHEP_DIR=$CLHEP -D Geant4_DIR=$G4INSTALL/lib64/Geant4-10.2.0 -D DD4HEP_USE_CXX14=ON ..        
     - make -j2
-    - make test
     - make install
+    - make test    
     - cd ../examples
     - mkdir build
     - cd build
@@ -46,15 +42,15 @@ slc6-gcc49:
 centos7-gcc49:
   tags:
     - docker
-  image: cern/cc7-base
+  image: clicdp/cc7-base
   script:
     - source .gitlab-ci.d/init_x86_64-centos7-gcc49-opt.sh
     - mkdir build 
     - cd build
     - cmake -D DD4HEP_USE_GEANT4=ON -D DD4HEP_USE_BOOST=ON -DBoost_NO_BOOST_CMAKE=ON -D DD4HEP_USE_LCIO=ON -D BUILD_TESTING=ON -DCLHEP_DIR=$CLHEP -D Geant4_DIR=$G4INSTALL/lib64/Geant4-10.2.0 -D DD4HEP_USE_CXX14=ON ..        
     - make -j2
-    - make test
     - make install
+    - make test    
     - cd ../examples
     - mkdir build
     - cd build