ros_comm: 1.11.7-0 in 'indigo/distribution.yaml' [bloom]

Increasing version of package(s) in repository `ros_comm` to `1.11.7-0`:

- distro file: `indigo/distribution.yaml`
- bloom version: `0.5.10`
- previous version for package: `1.11.6-0`

## message_filters

- No changes

## ros_comm

- No changes

## rosbag

- No changes

## rosbag_storage

- No changes

## rosconsole

- No changes

## roscpp

```
* fix segfault due to accessing a NULL pointer for some network interfaces (#465 <https://github.com/ros/ros_comm/issues/465>) (regression from 1.11.6)
```

## rosgraph

- No changes

## roslaunch

```
* fix the ROS_MASTER_URI environment variable logic on Windows (#2 <https://github.com/windows/ros_comm/issues/2>)
```

## roslz4

- No changes

## rosmaster

- No changes

## rosmsg

- No changes

## rosnode

- No changes

## rosout

- No changes

## rosparam

- No changes

## rospy

- No changes

## rosservice

- No changes

## rostest

```
* make rostest use a random master port and run rostests in parallel (#468 <https://github.com/ros/ros_comm/issues/468>)
```

## rostopic

- No changes

## roswtf

- No changes

## topic_tools

- No changes

## xmlrpcpp

- No changes