[utility] auto-detection of cloud VM instance type

Added a utility to auto-detect the type of VM instance for
AWS, Azure and GCE public clouds.

Follow-up changelists will make use of this functionality if
auto-configuring the built-in NTP client upon startup of kudu-master
and kudu-tserver.

Change-Id: I083f4803decaef5d6e7d44184bbd98b074d2578b
Reviewed-on: http://gerrit.cloudera.org:8080/14866
Reviewed-by: Adar Dembo <adar@cloudera.com>
Tested-by: Kudu Jenkins
6 files changed