pkgbase: split kerberos binaries and libs

[dfr]

Summary

This allows installing packages that depend on kerberos libraries
without pulling in all the binaries. It also moves libgssapi to runtime
to allow installing kerbereos libraries without adding a dependancy on
the large utilities package. It makes sense to put libgssapi in runtime
rather than kerberos-lib since this is a plugin layer which is intended
to support any GSS-API mechanisms, not just kerberos.

MFC after: 2 weeks

[manu]

You need to modify release/package/Makefile.package to add comments/desc for the new package.

[dfr]

Updated Makefile.package to add entries for kerberos-lib

[manu]

LGTM, please add in the commit message that sshd is one of those binaries that one might want to install without having all the kerberos binaries pulled in.

[dfr]

Add an example use-case for kerberos-lib to the commit message.

[dfr]

FIx a typo in Makefie.packages