Bug 1195947

Description of problem:
The "glusterfs" package is perceived as containing too much files. For very slim QEMU hypervisor installations, all packages are expected to have minimal contents.

Currently glusterfs-api pulls in the following dependencies:
- glusterfs-libs
- glusterfs

The glusterfs-libs package only contains the needed files, that is acceptable. Unfortunately the "glusterfs" package is a 'catch' all package and contains more files then glusterfs-api actually needs:
- xlators that can not be enabled on the client-side through the CLI
- glusterfsd binary (and glusterfs symlink)
- documentation/manpages that should not be needed for a library dependency
- logrotate config that does not apply to libgfapi logs
- /etc/sysconfig/glusterd options file
- ... maybe more?

In addition to that, the description of the sub-packages is not really correct. The "glusterfs" package does not contain the CLI anymore, this confused some users.

I suggest to introduce a glusterfs-client package, that contains the client-side xlators. For libgfapi applications, the dependencies should then become:
- glusterfs-api
- glusterfs-libs
- glusterfs-client

While this is getting done, we should check the dependencies for the glusterfs-cli package. glusterfs-cli depends on the socket xlator (and maybe rpc?), these would be candidates to move to glusterfs-libs. In the end, glusterfs-cli would then become fully functional with only a dependency on glusterfs-libs (making the vdsm people happy).