Fix log capture implementation to poll the logs in a sub process.
Fix log capture implementation to poll the logs in a sub process.

In order to use this feature:
tester.start_euca_logs() // will start the sub process and begin tailing all logs on CLC WS CC SC NC
tester.stop_euca_logs() // stop gathering logs
print tester.cloud_log_buffer // print the CLC log

shaon/eutester,nagyistoce/eutester,tbeckham/eutester,nagyistoce/eutester,tbeckham/eutester,shaon/eutester,sjones4/eutester,sjones4/eutester,nephomaniac/eutester,nagyistoce/eutester,sjones4/eutester,tbeckham/eutester,nephomaniac/nephoria,shaon/eutester,shaon/eutester,nagyistoce/eutester,nephomaniac/eutester,nephomaniac/eutester,tbeckham/eutester,sjones4/eutester,nephomaniac/nephoria