Better document how to verify PGP signature

Add text clarifying our unusual packaging of the PGP signature inside
a tar file.

ticket: 7927
target_version: 1.13
tags: pullup
Fix typo in doc for krb5_get_init_creds_keytab()

ticket: 7880
target_version: 1.13.1
tags: pullup
Update mitK5features.rst for 1.13
Parse "ktadd -norandkey" in remote kadmin client

The remote kadmin client would not parse the "-norandkey" option to
the ktadd subcommand, terminating option parsing and possibly causing
options to be interpreted as principal names.

ticket: 7962
target_version: 1.13.1
tags: pullup
Report output ccache errors getting initial creds

In init_creds_step_reply, if we get an error storing output
credentials, do set ctx->complete (since retrieving creds or times
will work at this point) but don't suppress the error code.

ticket: 8028 (new)
target_version: 1.13.1
tags: pullup
Add test for kinit output ccache error

ticket: 8028