Ping on AES rotate

Immediately after an AES key rotate, ping all the minions. Should help
resolve #15415.
Only ping connected minions
Fire an event on AES key rotate.

Also setup a config file option for ping-on-rotate.
Merge branch 'rotate_event' into issue_15415
Implement flag for ping_on_rotate
Add docs about auth retry options
Add note about large install to config file
Added salt-unity manpages to setup.py data_files

Refs #13937
Fix --define directive for Cent5 builds
Merge pull request #15853 from terminalmage/buildpackage-el5

Fix --define directive for Cent5 builds
Fix encoding issues in nested output

This fixes #15542
Remove unused import
Merge pull request #15854 from terminalmage/bp-15546

Backport #15546 to 2014.7 branch
BUG: Fix the absolute directory check in file.symlink for the path of the symbolic link itself and perform user expansion on that.

Conflicts:
	salt/modules/file.py
Merge pull request #15868 from rallytime/bp_f8177149

Backport f8177149
Fix incorrect docstring

mod_watch just executes the module.run state here, which does not use
the 'func' parameter. This commit fixes the documentation to reflect the
proper argument name.
Merge pull request #15873 from terminalmage/fix-docstring

Fix incorrect docstring
Merge pull request #15842 from whiteinge/doc-salt-unity-data-files

Added salt-unity manpages to setup.py data_files
Allow the docs to build by faking libcloud's `__version__` attribute.
Merge pull request #15879 from s0undt3ch/hotfix/protect-from-older-libcloud

Allow the docs to build by faking libcloud's `__version__` attribute.