dashboard/app: disable tests on Travis
dashboard/app: disable tests on Travis

This is very frustrating. Testing with 'go test' does not really work.
All tests fail with:
util_test.go:51: Could not find dev_appserver.py: exec: "dev_appserver.py": executable file not found in $PATH
And I can't even now find a way to download this dev_appserver.py thing.

Update #1461

xairy/syzkaller,xairy/syzkaller,xairy/syzkaller,xairy/syzkaller,xairy/syzkaller,xairy/syzkaller,google/syzkaller,google/syzkaller,google/syzkaller,google/syzkaller,google/syzkaller,google/syzkaller,xairy/syzkaller,google/syzkaller