ec2_snapshot got missed when moving to a common argument spec.
It could already make use of the capabilities (as it uses
ec2_connect) and the documentation suggested it supported the
common argument spec (thanks to the documentation fragment work)
so it was just a matter of fixing the argument spec.
Removed unnecessary documentation for profile and security_token
that is covered by documentation fragment
Also removed spurious documentation flags (default: null, aliases: [])
which aren't needed.
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
Allow security tokens and profiles to be used as arguments
to the 'common' ec2 modules
Mostly refactoring to provide two new methods,
`get_aws_connection_info`, which results in a dict that can be
passed through to the boto `connect_to_region` calls, and
`connect_to_aws` that can pass that dict through to the
`connect_to_region` method of the appropriate module.
Tidied up some variable names
Works around boto/boto#2100
profiles don't work with boto < 2.24, but this detects for that
and fails with an appropriate message. It is designed to work
if profile is not passed but boto < 2.24 is installed.
Modifications to allow empty aws auth variables to be passed
(this is useful if wanting to have the keys as an optional
parameter in ec2 calls - if set, use this value, if not set,
use boto config or env variables)
Reworked validate_certs improvements to work with refactoring
Added documentation for profile and security_token to affected modules
