update docsite about new variable inventory_file

fix inventory.basedir is not absolute path when hostfile is startswith "./"

Fix some typos discovered during casual reading

Brings postgresql_db examples in line with documentation.

As of now, the documentation lists a parameter as "name",
whereas the examples use a parameter called "db". This brings
them in line.

forking least possible

digital_ocean #3438: use get instead of [] to prevent KeyError

closes #3518

Modified playbooks2.rst to include conditional boolean example.

Fix traceback when openstack do not have OS-EXT-IPS:type attached to add...

    failed: [127.0.0.1] => {"failed": true, "parsed": false}
    invalid output was: Traceback (most recent call last):
      File "/tmp/ansible-1376083321.99-111209413777779/nova_compute", line 1176, in <module>
        main()
      File "/tmp/ansible-1376083321.99-111209413777779/nova_compute", line 239, in main
        _get_server_state(module, nova)
      File "/tmp/ansible-1376083321.99-111209413777779/nova_compute", line 198, in _get_server_state
        private = [ x['addr'] for x in getattr(server, 'addresses').itervalues().next() if x['OS-EXT-IPS:type'] == 'fixed']
    KeyError: 'OS-EXT-IPS:type'

This extension was added less than 6 month ago, and so cannot be used on a release
older than Grizzly ( like Folsom ).

Commit of the extension : https://review.openstack.org/#/c/21453/

See https://wiki.openstack.org/wiki/ReleaseNotes/Grizzly#Key_New_Features_2

The existing code was using:
  a[b][c[d]]
where a[b] would always exist and c[d] would always exist.
But the nested index would not alway exist, particularly when a DigitalOcean item disapeared.

This changes that nested index to a `get` and properly handles None results.

This bug was present in two spots in this file.

Previous patch was reverted due to the fact that there was an issue
with the results not always being a dictionary (they're sometimes
a unicode string, ie. when the with_items is used with yum). This
minor change corrects that by checking for a dict object.

This reverts commit 1a4e6e41.

docfix: grammar in docstring for sysctl module

that loop over a lookup plugin. Fixes #3704 and #3735

to ensure consistent behavior, hosts should look like this:

    hosts: webservers:&boston:!rack42

So when applying the host selectors, run those without the "&" first,
then the &s, then the !s.

Closes #3500

When service module is used on unsupported Linux system where init
script is used directly, LinuxService.svc_cmd is None so .endswith()
fails.

Fixes issue #3533

Signed-off-by: Brian Coca <briancoca+dev@gmail.com>

With the command line option "-c local", ansible and ansible-playbook
should never ask for a SSH password even if this is set in the config.

Fixes #3720