Create shell scripts to update nav2 repos on release (space-ros#142).

Now nav2 package versions can be updated with `./docker_update_nav2_repos.sh` script.

navigation2/docker_update_nav2_repos.sh

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+#!/bin/bash
+SPACE_ROS_IMAGE="${SPACE_ROS_IMAGE:-osrf/space-ros:latest}"
+
+docker run --rm \
+    -v ./:/home/spaceros-user/mount/ \
+    -w /home/spaceros-user/mount/ \
+    $SPACE_ROS_IMAGE \
+    bash -c './update_nav2_repos.sh'

navigation2/excluded-pkgs.txt

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+nav2_rviz_plugins

navigation2/navigation2-pkgs.txt

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+navigation2

navigation2/update_nav2_repos.sh

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+#!/bin/bash
+
+source $SPACEROS_DIR/install/setup.bash
+SCRIPT_PATH="$SPACEROS_DIR/scripts"
+bash $SCRIPT_PATH/generate-repos.sh \
+    --rosdistro $ROS_DISTRO \
+    --packages navigation2-pkgs.txt \
+    --excluded-packages excluded-pkgs.txt \
+    --outfile navigation2.repos \
+    --upstream false # this allows us to select specific sub-packages from a single repo