Suspend packages - one call for multiple packages

Refactor setPackageSuspended into setPackagesSuspended. The rationale
is that the consumers of this API are likely to want to remove
multiple packages at once. Rather than calling the API N times, call
it just once.

The good part is that we already have the broadcast intent for
suspended packages take an array so only one broadcast. Less stress
on the system.

Another good part is that (right now) we only have one consumer of
this API and it will be easy to make changes once this CL goes in.

As a shell command, for consistency only allowed one package at
a time.

Bug: 22776761
Change-Id: Ic8b8cf64d0a288ea3a282bb7b72f9d663b3b0049