Add dumpsys support to RulesManagerService

Override the dump method so RuleManagerService can dump its state
into logs. Crude argument support has been added for dumping
specific fields in an easy to process way (for test scripts to use).

Tested with:
make -j30 FrameworksServicesTests
adb install -r -g \
  "out/target/product/angler/data/app/FrameworksServicesTests/FrameworksServicesTests.apk"
adb shell am instrument -e package com.android.server.timezone -w \
  com.android.frameworks.servicestests \
  "com.android.frameworks.servicestests/android.support.test.runner.AndroidJUnitRunner"

Test: See above.
Test: Manual; adb shell dumpsys timezone [-format_state piscotz]
Bug: 31008728
Change-Id: I0ad83aa245232ed0b983ceacd8accfb876824d6f