Trimming white spaces and adding single quotes
Trimming white spaces and adding single quotes

Trimming mac address string and adding single quotes to let user
notice other bad inputs

Change-Id: I42aaef37b882fad4e5b37f5ba859034910fc84be
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1076564
Signed-off-by: Simone Tiraboschi <cb03129c66ba4da7ba7044049d0f43907bf857bb@redhat.com>

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