Merge branch 'cc/test-oidmap'

Extend the test coverage a bit. * cc/test-oidmap: t0016: add 'remove' subcommand test test-oidmap: remove 'add' subcommand test-hashmap: remove 'hash' command oidmap: use sha1hash() instead of static hash() function t: add t0016-oidmap.sh t/helper: add test-oidmap.c