Move SharedPreferenceLogger to instrumentation package.

Bug: 30914916
Test: SettingsUnitTests and RunSettingsRoboTests

- Added interface to abstract logger
- Added test for SharePrefLogger
- Moved Existing tests for instrumentation to robotests.

Change-Id: I2b431ea4b0fd09d0f11389d8b9181448f08a52c5
9 files changed