Fix execution with --order
Fix execution with --order

https://softwarefactory-project.io/r/9717 changed the way mock was
invoked when running --order, and removed the enclosing of
$ADDITIONAL_MOCK_OPTIONS between quotes. This breaks the way mock
is executed, since "-D repo_bootstrap 1" is not correctly processed.

Restoring the old behavior with an if clause.

TG-463

Change-Id: I13f511a837336cd09aae30c8715b6cdd486d436f

openstack-packages/DLRN,openstack-packages/DLRN,openstack-packages/delorean,openstack-packages/delorean