Skip the "--abi" flag on "adb install" if present.

This flag needs to be passed through to the package manager.
Without this change, the argument to this flag is interpreted
as a filename.

NOTE: If we don't want to add special treatment for this flag,
we'll have to assume that all flags with a -- prefix have an
argument, and that isn't necessarily true.

Change-Id: I78c3fa842bc24148d83d7278e6dee395686240a0