Merge "Have NetworkPolicyManagerService create MultipathPolicyTracker" am: a34d9a7af1 am: 8f96256d85 am: 27ace52564

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1519960

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I023815a53f01a0459b94033b7e2fa2ed91cca86a