simple typo found in docs
Make ssh key regular expression more strict
fixed module network.traceroute
fixed module network.traceroute
Merge pull request #4001 from kvbik/just-typos

simple typo found in docs
Merge pull request #4005 from plueschopath/develop

fixed module network.traceroute
Add the word Example to docstrings
Merge pull request #4006 from techhat/s3

Add the word Example to docstrings
Merge pull request #4004 from dekkers/ssh-key-regexp

Make ssh key regular expression more strict
make libvirt tunnelling migration optional
fix syntax error
Fix bad var in error checking
Merge pull request #4009 from s0undt3ch/issues/4008

Properly handle no multiprocessing children `OSError`. Fixes #4008.
expand docstring to include example of adding a Ubuntu PPA
update pkgmgr example
doc consistency fix
Merge pull request #4011 from ahammond/develop

expand docstring to include example of adding a Ubuntu PPA
Try to handle `SIGCHLD` as best as we can under python 2.6. Fixes #4008.

* We do some try/except "magic" to see if we import a safe `subprocess` module on `salt.utils.process`.
* If we're running under python 2.6, we try to import `subprocess32` which properly handles our problem.
* If the above step fails, we import the build-in `subprocess` module.
* We also define `SAFELY_HANDLE_SIGCHLD` on `salt.utils.process` so we can know if we need to reset the `SIGCHLD` handler on `salt.modules.cmdmod` so the know bug is not triggered, again, under python 2.6

For some additional info, see:
  * #4008
  * http://bugs.python.org/issue912
  * http://bugs.python.org/issue1731717