Delete fcntl lock file on Unlock; merge common code.

 (upstream: 1f0f047)

Change-Id: I731a3c4af2d9fed7795ec52c42fb6ada00a04c60
blobserver: rearrange interface.go a bit; add ShutdownStorage

Change-Id: Idbcbf4211331e9b53185e9dd951a174c06c9215c
camlistored: on SIGINT, shut down cleanly, closing the kvfile index db

Change-Id: Ifcb8c22b088586bc72ad98dacc3be2d46e77928b
Merge branch 'master' of https://camlistore.googlesource.com/camlistore