get runs CLI command doesn't limit number of records queried by default

If user does not specify a limit, the CLI default to Int.MAX_VALUE:

https://github.com/caskdata/cdap/blob/release/5.0/cdap-cli/src/main/java/co/cask/cdap/cli/command/GetProgramRunsCommand.java#L59

Instead, it should not pass the limit parameter to the backend and perhaps left the backend server default to whatever value it defaults to on its own.

Two other places we do this are for getting stream events:
https://github.com/caskdata/cdap/blob/develop/cdap-cli/src/main/java/co/cask/cdap/cli/command/GetStreamEventsCommand.java#L57

and get program logs:

https://github.com/caskdata/cdap/blob/release/5.0/cdap-cli/src/main/java/co/cask/cdap/cli/command/GetProgramLogsCommand.java#L53