Set keepalive to 5 seconds in paramiko_ssh.py

This update resolves https://github.com/ansible/ansible/issues/6476.
Improve the ec2_snapshot argument spec and docs

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.
if key name already exists on tenant, check if public_key is offered that it matches the existing key
Fixed incorrect handling of paths contaiin whitespaces
Enable use of vault password for --syntax-check, --list-hosts and --list-tasks
Added integration tests for encrypted vars
Enabled integration tests for encrypted vars in Makefile
Initial SoftLayer API inventory client.
Remove some development code. EC2 -> SoftLayer
Update some doc strings
Update dependencies. Add some doc notes.
Add windows azure inventory plugin
Add azure VM provisioning/termination module
Add rax_meta module

Also update rax to mirror meta value normalization from rax_meta
fixing problem where ansible would error out because Amazon was saying the group didnt exist yet (needed to wait a few more seconds for amazon to propagate correctly)
made nested lists diff lengths - caused confusion

As a relatively-new user to Ansible, the Nested Loop example made me think it was looping through both lists together (`alice` would go with `clientdb`, `bob` with `employeedb`) and not actually nested. I realize now I was just being stupid, but I feel making the example lists different lengths would prevent such confusion in the future.
Fix order of merging variables for the combined cache

Fixes #7598
Merge branch 'rax-meta' of https://github.com/sivel/ansible into sivel-rax-meta
Adding the new rax_meta module to the CHANGELOG
Merge branch 'sivel-rax-meta' into devel