"fab up" should be parallelizable

[karlp]

https://gist.github.com/bitprophet/26ff1aeed14650a269eb

16:29 < bitprophet> 'fab meta'. important is not to do 'fab -H some,hosts meta' because that'll try to run meta
itself multiple times :)
16:29 < karlp> that's pretty much what I'd tried,
16:29 < karlp> I may have been seeing some interaction with fabtools vagrant
16:30 < karlp> the meta was being run once per host, then the parallel would get run on all hosts, once for each
run of the meta
16:30 < karlp> yeah, fab vagrant meta was running meta on the multiple hosts,
16:30 < karlp> like you describe :)
16:31 < karlp> so, I'm sure it can be fiddled eventually :)

[karlp]

Double confirmed! this makes it very slow to turn on 10 AWS instances!