build(travis): gracefully shut down the sauce connect tunnel after the tests are done running

This is to prevent sauce connect tunnel leaks.

Closes #12921

.travis.yml

@@ -61,6 +61,7 @@ script:
   - ./scripts/travis/build.sh
 
 after_script:
+  - ./scripts/travis/tear_down_browser_provider.sh
   - ./scripts/travis/print_logs.sh
 
 notifications:

lib/browserstack/teardown_tunnel.sh

@@ -0,0 +1,8 @@
+#!/bin/bash
+
+set -e -o pipefail
+
+
+echo "Shutting down Browserstack tunnel"
+echo "TODO: implement me"
+exit 1

lib/saucelabs/teardown_tunnel.sh

@@ -0,0 +1,16 @@
+#!/bin/bash
+
+set -e -o pipefail
+
+
+echo "Shutting down Sauce Connect tunnel"
+
+killall sc
+
+while [[ -n `ps -ef | grep "bin/sc" | grep -v "grep"` ]]; do
+  printf "."
+  sleep .5
+done
+
+echo ""
+echo "Sauce Connect tunnel has bee shut down"

scripts/travis/tear_down_browser_provider.sh

@@ -0,0 +1,4 @@
+#!/bin/bash
+# Has to be run from project root directory.
+
+./lib/${BROWSER_PROVIDER}/teardown_tunnel.sh