Remove dead code from the mechglue initialization

The stat check in gss_indicate_mechs had no consequent and would have
been redundant with logic in updateMechList if it did.

[ghudson@mit.edu: elaborated commit message; removed unused
g_mechSetTime and now-irrelevant comment]
Load mechglue config files from /etc/gss/mech.d

In addition to loading /etc/gss/mech, glob for *.conf files in
/etc/gss/mech.d.  Load only config files which have changed since the
highest mtime we saw in the previous scan.  Scan at most once per
second to avoid excessive numbers of filesystem syscalls for busy
GSSAPI applications.

[ghudson@mit.edu: rewrote commit message; style changes; added
once-per-second throttle on glob/stat calls]

ticket: 7882 (new)
Document /etc/gss/mech.d/*.conf

[ghudson@mit.edu: editorial changes]