Davies Liu:  delay fs_getattr() until needed

Conflicts:
	mfsmaster/matoclserv.cc
Davies Liu: remove logging in metarestore
Davies Liu: bugfix: memory leak in mfsmount
Davies Liu: auto repair invalid copies
Davies Liu: bugfix: no parent in parents edge
Davies Liu: remove cache entry after client invalidate it
Davies Liu: add opt usedircache, syslog of dcache
Davies Liu: bugfix
master: remove warning at compilation