CI: improve stability

-- Added apt-get update before any apt-get command in shell script on VM
     Necessary if the cloud image is a bit out of sync
  -- Added VM memory parameter when creating VM
     Necessary for cppcheck build
  -- Aligned some scripts with develop branch

Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

ci-scripts/createVM.sh

@@ -60,6 +60,7 @@ then
 fi
 
 VM_TEMPLATE=ci-
+VM_MEMORY=2048
 JOB_NAME=XX
 BUILD_ID=XX
 VM_NAME=ci-enb-usrp
@@ -98,6 +99,7 @@ case $key in
     ;;
     -v4)
     VM_NAME=ci-cppcheck
+    VM_MEMORY=8192
     shift
     ;;
     -v5)
@@ -130,6 +132,7 @@ case $key in
         ;;
         cppcheck)
         VM_NAME=ci-cppcheck
+        VM_MEMORY=8192
         ;;
         gnb-usrp)
         VM_NAME=ci-gnb-usrp
@@ -176,7 +179,7 @@ echo "VM_NAME             = $VM_NAME"
 echo "############################################################"
 echo "Creating VM ($VM_NAME) on Ubuntu Cloud Image base"
 echo "############################################################"
-uvt-kvm create $VM_NAME release=xenial --memory 2048 --cpu 4 --unsafe-caching --template ci-scripts/template-host.xml
+uvt-kvm create $VM_NAME release=xenial --memory $VM_MEMORY --cpu 4 --unsafe-caching --template ci-scripts/template-host.xml
 echo "Waiting for VM to be started"
 uvt-kvm wait $VM_NAME --insecure