packaging: api: redirect /api to /ovirt-engine/api by duplicating war installation

Using forward servlet is not a complete solution as there is some
limitation of sharing context.

So java based solution is not easily possible.

Jboss rewrite rules cannot be used as it ignores the matrix ';' suffix.

Using apache has side effect is a redirect between /api and /api/ as apache
must normalize the directory due to internal limitation.

We end up installing war twice one per context.

Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1031597
Change-Id: I021c98bb6b5dcd0812db2b130967ebea27fad4e9
Signed-off-by: Alon Bar-Lev <alonbl@redhat.com>