travis: remove traces and use travis_wait in ARM build (#20296)

* travis: remove debug traces

* travis: Add travis_wait to the test run

* travis: increase travis_wait time

.travis.yml

@@ -47,10 +47,8 @@ jobs:
       dist: xenial
       go: 1.13.x
       script:
-        - cat /proc/cpuinfo
-        - free -h
         - go run build/ci.go install
-        - go run build/ci.go test -coverage $TEST_PACKAGES
+        - travis_wait 30 go run build/ci.go test -coverage $TEST_PACKAGES
 
     - stage: build
       os: osx