include basedir as 'playbook_dir' variable

closes #4246

Merge branch 'fix_autorized_keys' of https://github.com/mscherer/ansible into mscherer-fix_autorized_keys

script there with a comma that would produce invalid configuration
upon being wrote again

it start to duplicate line, because this create
a empty option in the list, and so the module add a new line along the previous
one. See

>>> ' a,b, '.strip().split(',')
['a', 'b', '']

Fail if requested variable is not available

Fix broken FreeBsdService class

Add VPC support for EIP module

Revert 4833c2fd

Fixes #4652

Fixes #4500 python bools return uppercase True and False, so allow those for BOOLEANS in module common

Add enable_availability_zone parameter to ec2 module. 

New bigip_pool_member module

update bug reporting suggestions a bit

Provide warning about "with_items: '{{ loop }}'" being redundant only when {{ starts the expression value.  Fixes #4582.

setup module, replace ':' by '_' in interface name, fix #4586

check for ubuntu distribution first