Fixes #5533
Closes #5605
Closes #5606
Closes #5607

I had to remerge this as the original would not automerge. #4703

Doc improvements / fixes

Merge branch 'fix-postgres_user_to_understand_pg_namespaces' of https://github.com/alanfairless/ansible into alanfairless-fix-postgres_user_to_understand_pg_namespaces

Merge branch 'postgres_alter_role' of https://github.com/jinnko/ansible into jinnko-postgres_alter_role

Conflicts:
	library/database/postgresql_user

Config resoution order correction and documentation.

Merge branch 'fix_rds_modify_security_group' of https://github.com/mohangk/ansible into mohangk-fix_rds_modify_security_group

Spelling correction.

apt: fixed pkg=<name>=<version> fails if package is not yet installed.

Tested and it fixes the problem on more recent versions of apt.

Remove superfluous/invalid quote

Allow the example to be copy-pasted with minimal confusion about the error.

Merge branch 'allow-equals-in-ini-vars' of https://github.com/worklez/ansible into worklez-allow-equals-in-ini-vars

Filter out messages that match the pattern username:password@host

Add the start of an integration test structure using Ansible playbooks, also added an assert action plugin to make writing those easier.

Small fix for ec2 validate_certs option

Adding 'validate_certs' option to EC2 modules

Also removing validate_cert option from the cloudformation module docs,
as it does not use the standard ec2 connection.