CA file is a new added config introduced to be used by
Ceilometer-zvm. When zvm inspector needs to communicate with xcat,
it will add the CA file into https communication so it can verify
the xcat is the one that zvm inspector wants to communicate with.
See following link for more info:
https://bugs.launchpad.net/ossn/+bug/1188189
Change-Id: Ib7f1ce2d621f6dd2b5d3b9a63a004abffbc3f223
44f02e7848