Handle PAM_MAXTRIES from modules.

bz#2249: handle the case where PAM returns PAM_MAXTRIES by ceasing to offer
password and keyboard-interative authentication methods.  Should prevent
"sshd ignoring max retries" warnings in the log.  ok djm@

It probably won't trigger with keyboard-interactive in the default
configuration because the retry counter is stored in module-private
storage which goes away with the sshd PAM process (see bz#688).  On the
other hand, those cases probably won't log a warning either.

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