[jsk_pcl_ros_utils/src] add onInitPostProcess for StaticPolygonArrayPublisher, PolygonArrayTransformer

[kochigami]

When I launch
StaticPolygonArrayPublisher (node name is set to [/people_detection/footstep_polygon_publisher)
and PolygonArrayTransformer (node name is set to [/people_detection/polygon_array_transformer)
of jsk_pcl_ros_utils, the warning below occurred.

[ WARN] [1498035213.941695751]: [/people_detection/footstep_polygon_publisher] onInitPostProcess is not yet called.
[ WARN] [1498035213.942671862]: '/people_detection/footstep_polygon_publisher' subscribes topics only with child subscribers.
[ WARN] [1498035214.353049047]: [/people_detection/polygon_array_transformer] onInitPostProcess is not yet called.
[ WARN] [1498035214.353923307]: '/people_detection/polygon_array_transformer' subscribes topics only with child subscribers.

If there is any comments, please let me know.

[k-okada]

I'll merge after travis passed, btw did jsk-ros-pkg/jsk_common#1513 (comment) help you to find this problem?

[kochigami]

btw did jsk-ros-pkg/jsk_common#1513 (comment) help you to find this problem?

Yes.

I was debugging my launch because it is not working, and I looked into the terminal log.
Then I found it.