CLOUDSTACK-7822: Fixed SSL Cert Tests and relaxed chain validation

Signed-off-by: Will Stevens <wstevens@cloudops.com>
CLOUDSTACK-7952: Remove private key from SslCertResponse (listSslCerts)

Signed-off-by: Will Stevens <wstevens@cloudops.com>
CLOUDSTACK-3383: Fetch CPU utilization more reliable.

This should fix that we can't gather CPU statistics on hypervisors
> Ubuntu 12.04

(cherry picked from commit 69ee01af9df8d72ccd8901d146726e74edda95d7)
Signed-off-by: Rohit Yadav <rohit.yadav@shapeblue.com>