cbuildbot: Remove --dump_config option in favor of cbuildbot_view_config.
cbuildbot: Remove --dump_config option in favor of cbuildbot_view_config.

The new cbuildbot_view_config script makes the --dump_config option to
cbuildbot itself obsolete.

BUG=chromium:328993
TEST=None

Change-Id: I053d4a9f6d4797f99b8148fdde8d666989adb67c
Reviewed-on: https://chromium-review.googlesource.com/181079
Tested-by: Matt Tennant <46e612415b446ccde19638e4035892001c237942@chromium.org>
Reviewed-by: David James <f231dc574bbeb62604660cbc162d1b8642a0a3af@chromium.org>
Reviewed-by: Mike Frysinger <8f3f75c74bd5184edcfa6534cab3c13a00a2f794@chromium.org>
Commit-Queue: Matt Tennant <46e612415b446ccde19638e4035892001c237942@chromium.org>

bpsinc-native/src_third_party_chromite,chadversary/chromiumos.chromite,chadversary/chromiumos.chromite,bpsinc-native/src_third_party_chromite,bpsinc-native/src_third_party_chromite