locking: sanlock: drop unused LOCKSPACE_SLEEP
locking: sanlock: drop unused LOCKSPACE_SLEEP

After dropping support for sanlock < 2.4,
this constant is no longer used.

Signed-off-by: Ján Tomko <4cab11cfb98d3c937327354a78eb07dbb6ee2bc6@redhat.com>
Fixes: c4951694786ecd45424769979762c17e4c8e56d0
Reviewed-by: Jonathon Jongsma <c7254805a17bd5c41e24c3a278fcbf3afcdfb0fa@redhat.com>

jfehlig/libvirt,crobinso/libvirt,libvirt/libvirt,crobinso/libvirt,jardasgit/libvirt,jardasgit/libvirt,nertpinx/libvirt,nertpinx/libvirt,crobinso/libvirt,olafhering/libvirt,nertpinx/libvirt,jardasgit/libvirt,crobinso/libvirt,libvirt/libvirt,jardasgit/libvirt,jfehlig/libvirt,jfehlig/libvirt,olafhering/libvirt,nertpinx/libvirt,nertpinx/libvirt,libvirt/libvirt,olafhering/libvirt,zippy2/libvirt,olafhering/libvirt,zippy2/libvirt,jfehlig/libvirt,jardasgit/libvirt,libvirt/libvirt,zippy2/libvirt,zippy2/libvirt