DRILL-6289: Cluster view should show more relevant information
Protobuf change to carry HTTP port info
Allow CORS for access to remote Drillbit metrics
Cross-origin resource sharing (CORS) is required to ensure that the WebServer is able serve REST calls for status pages.
Materialize relevant metrics
1. Heap memory (incl usage)
2. Heap memory (incl usage)
3. Average System Load (last 1 min)
4. Option to view from other nodes (pop out)
5. Added Glyphicons
Update System Table and related tests
1. Updated System Table to show HTTP port
2. Updated unit tests
Skip updating remote bit info when HTTPS (SSL) or Authentication is enabled.
Default CpuGaugeSet is public; Added Gauges
* CPU Utiization by Drill
* Uptime
Show ALL Buttons, but do HTTPS Check
Reduce power button to icon
Allowing CORS for /status/metrics only
Accounting for situations when JVM does not report Process CPU Load
i.e. returned value is negative.
See https://docs.oracle.com/javase/7/docs/jre/api/management/extension/com/sun/management/OperatingSystemMXBean.html#getProcessCpuLoad()
Addressed shutdown security conditions
Added C++ Client Protobuf
Added steps for Protobuf generation to protocol/readme.txt
This closes #1203
