[JStorm-runner] Fix two issues of metrics reporter and waiting time on local mode

[bastiliu]

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[bastiliu]

@peihe
Could you please help to review the fixes?

[coveralls]

Changes Unknown when pulling 99c06fb on bastiliu:jstorm-runner into ** on apache:jstorm-runner**.

[peihe]

retest this please

[coveralls]

Changes Unknown when pulling 99c06fb on bastiliu:jstorm-runner into ** on apache:jstorm-runner**.

[peihe]

R: +@peihe

LGTM

This PR looks good by itself, failed tests were due to metrics fixes revealed the test flakiness.

[bastiliu]

Merged and close.