Changed some keys to be consistent with the server config, and removed
some others.
We're now using jsonconfig to get the keys and validate the config.
Removed some unused funcs/methods, moved some global vars as members of a client.
Also, having two possible defaults for the secret keyring
(.config/camlistore/identity-secring.gpg and .gnupg/secring.gpg)
was annoying and confusing imho, so I removed the latter.
http://camlistore.org/issue/259
Change-Id: Icf79fa8822b62b5d91843698861dd19cb553607a
mpl