Paul Hinze 96c20f0dd7 communicator/{ssh,winrm}: seed random script paths ...

Without a seed, the "random" script path locations for the remote-exec
provisioner were actually deterministic!

Every rand.Int31() would return the same pseudorandom chain starting w/
the numbers: 1298498081, 2019727887, 1427131847, 939984059, ...

So here we properly seed the communicators so the script paths are
actually random, and multiple runs on a single remote host have much
less chance of clobbering each other.

Fixes #4186

Kudos to @DustinChaloupka for the correct hunch leading to this fix!

2016-06-29 09:32:24 -05:00

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