packaging: Fix timeout for /api for Apache < 2.4

Versions of Apache older than 2.4 don't copy the setting of the proxy
timeout parameter from the Proxy directive to the ProxyPass directives.
To fix this this patch repeats the value of the timeout parameter in the
ProxyPass directive used for the RESTAPI.

Change-Id: I0196fed84c8415ace5dca6bb43822cef8a002629
Bug-Url: https://bugzilla.redhat.com/853045
Signed-off-by: Juan Hernandez <juan.hernandez@redhat.com>