core: Removed the unused GetImageByImageIdQuery

This patch removes the unused query GetImageByImageIdQuery.

This patch contains:
1. Removing aforementioned class, which has no usages in the code.
2. Removed the GetImageByImageId constant from VdcQueryType.
3. Renamed GetImageByImageIdParameters to
   GetStorageDomainsByImageIdParameters since
   GetStorageDomainsByImageIdQuery is now the only class that uses it.

Change-Id: Ib1ee84d3e8c903fc9a9cfd6144e8c44af06d04c4
Signed-off-by: Allon Mureinik <amureini@redhat.com>