Split module into a main calling function, and a generic
(Linux useradd/usermod/userdel) User class.
Added a __new__ function that selects most appropriate superclass
Added a FreeBSD User class
Tested against FreeBSD 9.0

Send a host to runner executor instead of a letter.

Discovered in #1463 .

Don't add file module arguments by default

This allows the postgresql_db module to work properly, as it uses
an argument named owner that conflicts with the file module.

Use previous proven multiprocessing logic as the simplification didn't have the same Ctrl-C handling and may
be subject to race issues, though still don't pass Runner to each.  Still seems performant.

Initialize sftp variable to fix error on transferless session

Make sure we always return 'rc' from the command module

If this is not a certainty, playbooks will fail without an 'rc' and checking both if there is an rc, and whether the 'rc' is (not) 0 is very complicated. (especially because ${something.rc} will not be substituted and all that)

Explicitly execute /bin/sh versus $SHELL because some folks have very incompatible/weird shells.  We do not
execute modules through the shell, this is only for basic ops, so should be sufficient.

in playbook mode, since the Runner still closes abstract host connections completely
and does not have a LRU.

user module: fix typo in documentation

Make with_items a lookup plugin

Use shutil.copyfile so as to preserve file ownership in authorized_keys

Only strip trailing newlines from output, preserving other space

Move contrib to .rst into the main docsite

Use the delegated host's interpreters

User is alias for name in 'user' module

code all together.

tyep -> type

Signed-off-by: bleader <bleader@ratonland.org>