pki: fix spice pki certificate parsing
pki: fix spice pki certificate parsing

fixed spice pki certificate parsing and moved it
to validation stage for having the correct certificate
subject in the answer file.

Change-Id: I0188e3f27008c989f6c0ff7de7fa47215fc32466
Signed-off-by: Sandro Bonazzola <fcb014d63786651910af5db2ecc5316c668188ef@redhat.com>

oVirt/ovirt-hosted-engine-setup,oVirt/ovirt-hosted-engine-setup