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This removes the remaining DictionaryValue usage from shill client and
fake client classes.

For minor apitest.cc change to c/b/e/api/vpn_provider:
TBR=emaxx@chromium.org

Bug: 1137487
Change-Id: Id3a84f1392f0d1586342b4441ad200f0a41110e0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2466931
Commit-Queue: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Pavol Marko <pmarko@chromium.org>
Reviewed-by: Azeem Arshad <azeemarshad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#818596}