change unsigned long long to sector_t
replace message send part with api
remove bitmap number parameter in md_send_suspend() and add this api in md.h
fix build warnnings
change the second parameter of dlm_release_lockspace from 3 to 0

when the node leaves the cluster, it shouldn't release the lockspace
immediately, otherwise other nodes in the cluster will work abnormally.
The workaround is to change this parameter to detect whether the
lockspace is busy.I think a better way is to check the nodes number
in the cluser.
some modifications to the test code
Merge pull request #10 from ldzhong/master

serveral fixing