core: Make GetVmsInit query accessible to users

This is required for regular users to access VMs via the RESTAPI.

Change-Id: If2278f0b8116ba873b8dc27f4d11d80f346cb216
Bug-Url: https://bugzilla.redhat.com/1102801
Signed-off-by: Juan Hernandez <juan.hernandez@redhat.com>