MB-16060: Do not free buffer cache blocks twice
MB-16060: Do not free buffer cache blocks twice

If the blocks are freed by filemgr_remove_all_buffer_blocks() then
there it is not necessary to call the same set of functions again
even if the file was picked as victim by another thread.
This prevents assertion in _fname_try_free, blockcache.cc, line 794

Change-Id: I9016097fd400718ff01e6194af5896c98cac8573

sushmaad/forestdb,sushmaad/forestdb,wurikiji/forestdb,couchbase/forestdb,zhaog/forestdb,hisundar/forestdb,zhaog/forestdb,couchbase/forestdb,jinxuan/forestdb,joliss/forestdb,joliss/forestdb,wurikiji/forestdb,jinxuan/forestdb,hisundar/forestdb