rpcbind: Code cleanup

Fix a number of style issues and attempt to reduce the diff to NetBSD.

Reviewed by: glebius, kib
Differential Revision: https://reviews.freebsd.org/D51773

rpcbind: do not exit abruptly if krpc.ko is not available

Reviewed by: glebius, rmacklem
Sponsored by: The FreeBSD Foundation

nfsd, rpcbind: add -P option to support pidfile path

The -P option, when specified opens a pidfile to a given path.
Both daemons also install a default pid file to the corresponding
locations, that

nfsd, rpcbind: add -P option to support pidfile path

The -P option, when specified opens a pidfile to a given path.
Both daemons also install a default pid file to the corresponding
locations, that is, /var/run/nfsd.pid and /var/run/rpcbind.pid.

Sponsored by: Juniper Networks, Inc.
MFC after: 7 days
Reviewed by: rmacklem
Differential Revision: https://reviews.freebsd.org/D50624

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rpcbind: Ensure krpc is present.

MFC after: 1 week
Reviewed by: rmacklem, glebius
Differential Revision: https://reviews.freebsd.org/D50627