Add tox integration to run unittests in supported python releases.
Travis-CI is used for test execution.

Additionally, the unittest TestQuotePgIdentifier was updated to support
using assert_raises_regexp on python-2.6.

Sample travis-ci output available at
https://travis-ci.org/ansible/ansible/builds/54189977

https://github.com/ansible/ansible-modules-core/issues/946

Not only match`/docker/`, but also `docker-` followed by a hex-id.

Example (shortened):
```
$ cat /proc/1/cgroup
8:blkio:/system.slice/docker-de73f4d207861cf8757b69213ee67bb234b897a18bea7385964b6ed2d515da94.scope
7:net_cls:/
```

fixed and reintroduced syncronize test, fakerunner object needed become_method to be it's default 'sudo'

Nothing we can do, when it sanitizes ssh_urls it's simply overzealous.

Was using persist_files=True when specifying the create paramater,
which breaks pipelining. Switched to use delete_remote_tmp=False instead,
which is the proper way to preserve the remove tmp dir when running
other modules from the action plugin.

overwrite and not merge hashing
corrected merge vs combined in all pertinent sections
fixed typoe in combined_Vars
removed redundant inventory call, moved grousp to proper priority
readded inventory vars to runner's vars
correclty added inventory this time

removes sycnronize test that does not work with current sudo setup
Fixes #10434

Fixes #10430

Also removed redundant resolution of sudo/su for backwards compatibility which
confused the conflict detection code.

- become constants inherit existing sudo/su ones
- become command line options, marked sudo/su as deprecated and moved sudo/su passwords to runas group
- changed method signatures as privlege escalation is collapsed to become
- added tests for su and become, diabled su for lack of support in local.py
- updated playbook,play and task objects to become
- added become to runner
- added whoami test for become/sudo/su
- added home override dir for plugins
- removed useless method from ask pass
- forced become pass to always be string also uses to_bytes
- fixed fakerunner for tests
- corrected reference in synchronize action plugin
- added pfexec (needs testing)
- removed unused sudo/su in runner init
- removed deprecated info
- updated pe tests to allow to run under sudo and not need root
- normalized become options into a funciton to avoid duplication and inconsistencies
- pushed suppored list to connection classs property
- updated all connection plugins to latest 'become' pe

- includes fixes from feedback (including typos)
- added draft docs
- stub of become_exe, leaving for future v2 fixes