Dev: apache: refactor pid use

ApachePID was a global variable set in a function as a
side-effect. This patch makes the pid processing more obvious.
High: Raid1: disallow md raid arrays as clone resources to avoid data corruption
Low: Raid1: make clone prevention overridable similar to the Filesystem RA
Low: Filesystem: switch to use ocf_is_clone helper function
High: Filesystem: finally get rid of SLES10 compatibility code

The code will remain maintained inside SLES10, no need to keep it around
upstream. The user-space OCFS2 integration method needed was never
merged into the upstream kernel.
Low: Xen: report error if the monitor does not find the guest
Merge pull request #310 from dmuhamedagic/xen

Low: Xen: report error if the monitor does not find the guest
Merge pull request #305 from l-mb/Filesystem-drop-ocfs2-zombie

Eliminate SLES10/OCFS2 support code from upstream
Merge pull request #293 from dmuhamedagic/apache-pid

Dev: apache: refactor pid use