common: Fixing /dev/shm problem
common: Fixing /dev/shm problem

/dev/shm caused some troubles for the ubuntu target :
    mkdir: cannot create directory `/dev/shm': File exists

In fact, the shm was synced as it's a relative exclude.

redhat-cip/edeploy,enovance/edeploy,lebauce/edeploy,redhat-cip/edeploy,enovance/edeploy,lebauce/edeploy,enovance/edeploy,enovance/edeploy,redhat-cip/edeploy,lebauce/edeploy,lebauce/edeploy,redhat-cip/edeploy