Fixes for su on freebsd

Addresses multiple issues when using su on freebsd including
* su prompt differs between platforms, so turned that check into a
  regex comparison instead of a simple string comparison
* not using '-c' after su causes problems, so added that for all
  platforms
* fixed quoting issues due to multiple uses of '-c' introduced by
  the above fix

Fixes #7503
Fixes #7507
Fix typo in variable name
unified calls to fs function vs duplicate functions for file and
directory
open_iscsi module: support RC 21 when listing logged-in target
Merge pull request #7531 from bcoca/make_one_fs_function

Make one fs function
Merge pull request #7539 from jimi-c/issue_7503_freebsd_su_fixes

Fixes for su on freebsd
Don't fail in rax_cbs when the volume is not found
Differentiate machinfo output key/val separator

get_hw_facts for HP-UX: machinfo in HP-UX B.11.23 uses '=' as separator between key and value, while B.11.31 uses ':'.
Update test strategies guide.
Remove duplicate table of contents in Conditionals
added solaris fact detection for ansible_pkg_mgr
Recent BSD su work introduced a failing test. Removed leading space from the assertion that seems to be the culprit.
Merge pull request #7563 from tima/fix-testutils-su

Recent BSD su work introduced a failing test. Removed leading space from...
Correct issue of handlers running on all hosts incorrectly

Also adds an integration test to catch this bug in the future.

Fixes #7559
Fixed documentation for etype parameter on acl module.

The etype parameter just had a copy of the default parameter documentation.
Changed it to reflect what it really is for.
Update test_strategies.rst

Typo - State should have been stage.
Update test_strategies.rst

Changed unit tests to unit test for the singular playbook...
Merge pull request #7532 from oasiswork/devel

open_iscsi module: support RC 21 when listing logged-in target
Merge pull request #7568 from MorrisA/patch-1

Update test_strategies.rst
require pycurl for linode module