Fix typos in ansible-playbook man page source

Note: the man page needs to be rebuilt.

Allow you to pass in arbitrary rsync options

simple random filter

Use common code for ec2_elb and ec2_elb_lb

Use common module document fragments for AWS modules

Fixes #4883

Uses the new get_aws_connection_info
and connect_to_aws common methods to reuse code

Now complains if region is not set in one of the
three possible methods

Also moved over to common documentation code so
this is actually based on #6913

Created common module doc fragment, and applied to all
modules that use ec2_connect or connect_to_aws as
they definitely share the common doc fragments

modules.rst: be consistent with service module documentation

ec2: added ability to set EBS optimized instances

add replica_set attr to mongodb_user module

Adding bold to service doc to call up state and enabled.

This reverts commit 2bfaacd1.

Fixes #6821

Merge branch 'rax-clb-nodes-nodeid' of https://github.com/sivel/ansible into sivel-rax-clb-nodes-nodeid