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When mandoline is run with --enable-multiprocess, we should run some
services in different processes. This reuses |qualifier| in
Identity (which is already used for content handlers that need to run in
different contexts) to be a process name in contexts where there is a
package alias. This places mojo:network_services in its own process, and
everything else in a different process.

When run without --enable-multiprocess, this change is a noop.

BUG=477435

Review URL: https://codereview.chromium.org/1126393006

Cr-Commit-Position: refs/heads/master@{#329421}