When a passwd(5) file is not available, fall back to master.passwd(5).

That's useful because the latter is needed for passwd-maps, anyway.
Make the master.passwd file name configurable in the same way as passwd.

While here, do a bit of cleanup:
 - Drop the HOSTS, PASSWD, GROUP, NETID #defines:
   They are used nowhere else and serve no purpose.
 - Use err(3), it's simpler and more precise than fprintf(3)+goto.
 - Drop a debug statement forgotten a decade ago.
 - In the manual, improve .Nd, DESCRIPTION and .Xrs.

Originally triggered by edd@'s gripes with our yp implementation.
Regarding the manual, using many tweaks from jmc@.

"I like this" ajacoutot@
"I think it's a good idea" edd@
"no opinion", "you decide" deraadt@

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