CDAP-633 RunId of Currently Running Program 

Based on the discussion at
https://issues.cask.co/browse/CDAP-633

history endpoint is moved to /runs endpoint, with default call to runs will return all currently active and past runs of a program.

while /runs?status={completed/failed/active} can be used to filter the returned records.

This PR contains CLI command change and UI changes as well.
non-static. Also this belongs in https://github.com/caskdata/common/blob/develop/common-cli/src/main/java/co/cask/common/cli/Arguments.java but should be OK for this release.