xmpp{client,server}_listener: Convert some calls to tail calls for efficiency

mod_pep: Use util.caps

mod_disco: Support for putting the server's caps hash in stream:features to allow the client to cache disco#info for the server instead of requesting it at each login.

util.caps: Entity capabilities hash generation (moved from mod_pep)

mod_posix: Some (perhaps temporary) changes to re-lock the pidfile after truncating, to avoid breaking prosodyctl

mod_posix: Truncate the pidfile before writing to ensure that we never overwrite with a PID shorter than the previous, and end with an invalid PID in the file.

prosodyctl: Warn and exit if any log files are not writeable, fixes #94

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