hang process instead of crash if env HANG_ON_ASSERTION set
hang process instead of crash if env HANG_ON_ASSERTION set

Change-Id: I477bbf0169ec8b5981f2e172aa2ef2607c85c2f4

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