LU-620 llite: add delete/remove_from_page_cache check

LU-620 llite: add delete/remove_from_page_cache check

Later 2.6.32 kernel use memory cgroup feature but does not export
truncate_complete_page but export delete_from_page_cache or
remove_from_page_cache, we need properly use them for pachless client
code.

Signed-off-by: Bobi Jam <bobijam@whamcloud.com>
Change-Id: I4b95da2b4cac7f2c2f63b69896dd91c3544a5473
Reviewed-on: http://review.whamcloud.com/1649
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Johann Lombardi <johann@whamcloud.com>