When the normal (acceptor) keytab is being used to obtain initial
credentials, it is reasonable to use the default hostbased service
principal (host/fully.qualified.localhost.domain) when no client
principal is given.  This behavior is not very reasonable when
the default client keytab is being used, as host/ credentials are
not normally client credentials.

Make kinit -i match up with the GSS-API behavior when client keytabs
are in use, using the name of the first entry in the keytab when
no name is explicitly given.

ticket: 7892

If kinit chooses a client principal based on anything other than the
current default ccache's principal name, apply collection rules if
possible.  When applying collection rules, if we don't find an
existing cache for the client principal, use the default cache if it
is uninitialized, instead of creating a new one.

ticket: 7689

Provide default values in pre.in for PROG_LIBPATH, PROG_RPATH,
SHLIB_DIRS, SHLIB_RDIRS, and STOBJLISTS so that they don't have to be
specified in the common case.  Rename KRB5_RUN_ENV and KRB5_RUN_VARS
to RUN_SETUP (already the most commonly used name) and RUN_VARS.  Make
sure to use DEFINES for local defines (not DEFS).  Remove some other
unnecessary makefile content.

The string "KDB:" has four characters, not three; check for all four
of them.

[ghudson@mit.edu: commit message]

ticket: 7636

Mostly this gets rid of the trailing space on line 2 after
bb76891f5386526bdf91bc790c614fc9296cb5fa.

Since there is no overlap between the clpreauth and kdcpreauth
interface declarations, there's no particular reason to combine them
into one header.  For backward compatibility and convenience, leave
behind a preauth_plugin.h which includes both.

Previously, we would happily accept -i or -t name and do nothing
with it, if -k was not given.  If the user is passing -i or -t, they
clearly want to use a keytab, so do so (but print a warning).

While here, enforce that only one of -t and -i is given.

ticket: 7218
tags: pullup
target_version: 1.11

The old man pages are gone, so we can't install them anymore.
Also clean up install and install-unix targets that were installing
the old man pages by hand.