CTS media files url refactor from suite-level to module-level

Refactor the cts dynamic config info into its own module
to be shared across CTS and ATest.

Bug: 113564361
Bug: 112586647
Test: cts-tradefed run cts -m CtsMediaTestCases
      cts-tradefed run cts -m CtsIntentSignatureTestCases
      cts-tradefed run cts -m CtsMediaStressTestCases
      atest CtsIntentSignatureTestCases
      atest android.media.cts.MediaScannerTest
      atest CtsMediaStressTestCases
      cts-tradefed run cts -m CtsMediaTestCases --shard-count 2
      cts-tradefed run cts -m CtsIntentSignatureTestCases --shard-count 2
      cts-tradefed run cts -m CtsMediaStressTestCases --shard-count 2

Change-Id: Ic7dd413f66b4badebef486de185fa0c1f80c6a42
Merged-In: Ic7dd413f66b4badebef486de185fa0c1f80c6a42
9 files changed