packaging: distribute ovirt-hosted-engine-ha.spec.in in tarball

.spec.in file is needed for a complete rebuild from the tarball.

Change-Id: I86c804f39a23b4cc905d52f74fb7621bf9e80bc4
Bug-Url: https://bugzilla.redhat.com/1018278
Signed-off-by: Greg Padgett <gpadgett@redhat.com>