feat(modules/file/check_hash): command line friendliness
feat(modules/file/check_hash): command line friendliness

Named parameters on the command line are given on the form "key=val".
This makes things awkward when Salt command line needs to be written on
the form:

    salt file.check_hash /etc/myfile hash=md5=abcabcabc

I'd much prefer

    salt file.check_hash /etc/myfile md5:absabcabc

Note that this change is not backward compatible.

saltstack/salt,saltstack/salt,saltstack/salt,saltstack/salt,saltstack/salt