Made a few things more consistent with the bulk of the other EC2
modules and removed an unnecessary check that is handled by
AnsibleModule

Currently if we are trying to register an instance that has not yet
been registered with the elb an exception is thrown.

This allows a volume to be cloned from a snapshot, a brand new
volume to be created, or an ephemeral volumes to be associated
at time of instance creation.

This avoids any race conditions associated with creating extra volumes
after instance creation (e.g. writes happening before the volume is
mounted).

In addition, this allows the root volume to be edited

Revert "Revert "Merge pull request #5540 from angstwad/cf-container-module""

This reverts commit c3408f20.

Conflicts:
	library/cloud/rax_files

This reverts commit b11d6227.

Conflicts:
	library/cloud/rax_files_objects

This reverts commit a807e3b9, reversing
changes made to df8ecded.

This reverts commit bedc616f, reversing
changes made to a807e3b9.

This reverts commit e759832d.

Fix regex match, the printf match should work with 0 or more numeric padding characters, not 1 or more

ELB(s) cause a weird formatting behaviour - it appears as EL**s**
Added choices documentation to the state option

All modules should be using /usr/bin/python in the shebang as ansible_python_interpreter processes this (see FAQ).
Fixing for standardization purposes.

ec2_vol module now takes optional snapshot argument
Added relevant module argument handler and documentation

This squashed commit fixed typos, changed to Py 2.4 compatible exceptions

rax module: improvements