Added fall back to "webrsync" in case of failure of "rsync" Portage synchronization. Added support for GPG signed Portage snapshot ("webrsync-gpg" feature).
"emerge-delta-webrsync" is also supported and preferred.
This code require #5198
Merge remote-tracking branch 'upstream/develop' into gentoo-webrsync

Conflicts:
	salt/modules/eix.py
Use yamlify_arg() in more places
Make --name a little more clear
Add opts to master file to test config module
Start on config module tests
Add more checks to config
Add manage_mode test
Disable failing config.manage_mode test, we will need to clean this
Add test to grains.setval
Add grains.get test
Preserve any functions that have not been re-run in the mine
Add mine.send
Add mine_functions to grains
Add master side capability to make mine accept single funcs
Make mine.update return True when finished
Update mine.send to parse args and kwargs more salty
Import salt.utils.winapi
Catch case where format_call stack traces and the trace is safe
mine.send is working!