r1025: Rename (across the samr and netlogon pipes, so far)

r1025: Rename (across the samr and netlogon pipes, so far)

pwd -> password
passwd -> password

username -> account_name

Also work on consistant structure feild names between these two pipes,
and fix up some callers to use samr_Password for the netlogon
credential code.

Andrew Bartlett
(This used to be commit 4e35418c2776f7b79be5b358ffd077754685d1ac)