Do not replace link to CA certs dir in CernVM

Set replace to false for the grid security certificates dir such that
the link to the CA certs dir in CernVM does not get replaced with an
empty directory.

Changes
	modified:   modules/gce_node/manifests/grid_setup.pp
Remove condor config file backed into cernvm

Delete the 50cernvm configuration file present in the CernVM3 condor
installation since it breaks GSI authentication, and thus job
negotiation.

Changes:
	modified:   modules/condor/manifests/client.pp