[ROS] Adding arm32v7 back to trusty based images

[ruffsl]

In anticipation for fixed arm32v7 ubuntu cloud images for trusty to propagate into the Docker Hub library image for ubuntu.
Related:

• [arm32v7] trusty-security does not exist for armhf? tianon/docker-brew-ubuntu-core#94
• https://bugs.launchpad.net/cloud-images/+bug/1711735

[tianon]

Diff:

diff --git a/_bashbrew-arches b/_bashbrew-arches
index d598193..22d0108 100644
--- a/_bashbrew-arches
+++ b/_bashbrew-arches
@@ -1,11 +1,19 @@
 ros:indigo @ amd64
+ros:indigo @ arm32v7
 ros:indigo-perception-trusty @ amd64
+ros:indigo-perception-trusty @ arm32v7
 ros:indigo-robot-trusty @ amd64
+ros:indigo-robot-trusty @ arm32v7
 ros:indigo-ros-core-trusty @ amd64
+ros:indigo-ros-core-trusty @ arm32v7
 ros:jade @ amd64
+ros:jade @ arm32v7
 ros:jade-perception-trusty @ amd64
+ros:jade-perception-trusty @ arm32v7
 ros:jade-robot-trusty @ amd64
+ros:jade-robot-trusty @ arm32v7
 ros:jade-ros-core-trusty @ amd64
+ros:jade-ros-core-trusty @ arm32v7
 ros:kinetic-perception-jessie @ amd64
 ros:kinetic-perception-jessie @ arm64v8
 ros:kinetic-perception-xenial @ amd64

[tianon]

LGTM

Arch changes only; merging!