Fixed -e "" on ansible-playbook.

The required package for selinux is libselinux-python

Merge branch 'fix_postgresql_db' of https://github.com/yteraoka/ansible into yteraoka-fix_postgresql_db

database names.

fix debian release version

Fixes #4014

Fix no kerberos

While this is not currently implemented in openssh as far as I know,
there is patch floating around on the web and this may land one day
upstream.

GSSAPIAuthentication has not been supported
due to PreferredAuthentications trick ( 2bdba17a )

Fix bug in uri where redirect check fails.

Fixes #4030

Update documentation about Jinja2 expressions in playbooks

Closes #3992

Adding documentation for role default variables

Fixes #4045

Defaults arguments must not be added to the connection keywords, as
the other postgresql modules already do.

Closes #4043

This was breaking at least the script module, so it would seem best
to check for it and set it to the default executable value

Currently, the accelerate daemon will be run as the sudo_user if
specified, which is incorrect.

Fix: raise correct error in accelerate mode

using pg_roles instead of pg_user
if database owner is a role (not user) then it can not select form pg_user table.