Streaming node add#434

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FinchPowers wants to merge 10 commits intojtriley:developfrom

datacratic:streaming_node_add

Commits on Aug 29, 2014

Commits on Sep 2, 2014

Streaming add nodes rather than wait for all
Mich
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Fixed pep8 check
Mich
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Commits on Sep 5, 2014

Streaming propagation as well
Mich
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streaming_add_nodes parallel ssh is_up check
Mich
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Fixed pep8 checks
Mich
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Commits on Sep 6, 2014

don't sleep before cycling if nodes were added
Mich
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Commits on Sep 9, 2014

No sleep if instances ssh needs to be check as this takes time
Mich
committed