[IPP] [UNKN] Issue #16: Fix keyword names (no -error on xxx-recoverable-storage-error) and IANA registrations

[msweet at apple.com]

[Issue Unconfirmed]

Regarding the xxx-recoverable-storage-error keywords for
printer-state-reasons, we need to remove the "-error" to conform for the
RFC 2911 rules for printer-state-reasons values (-error means the printer
is stopped; the printer may not be stopped for recoverable errors).

See:

    http://www.pwg.org/archives/ipp/2014/017919.html

for the full discussion.

Link: http://www.pwg.org/issues/16