getProxy in ConnectivityService returns port w/PAC

Changes the PacManager to report message back to ConnectivityService
to send a broadcast once the download has completed.  This allows the
ConnectivityService to store the correct proxy info for getProxy().

This made the problem arise that ProxyProperties was not handling port
while it had PAC.  Added small fix for equals() and parcelization.

The combination of these fixes seems to resolve Bug: 11028616.

Bug: 11168706
Change-Id: I92d1343a8e804391ab77596b8167a2ef8d76b378