Address CTS flakiness

- Increase TTLs inside test config for MetricActivation tests.
- Wait until stats service is active after rebooting
- Increase sleep threshold for testConnectivityChange tests to address
failures in Pixel 1

Bug: 132274449
Bug: 132198834
Test: cts-tradefed run cts-dev -m CtsStatsdHostTestCases -a armeabi-v7a
Change-Id: I931802450b8f6fce778ffc13379403d1b234778a
5 files changed