Adjust RunCommandWithRetries raise to make python happy.
Adjust RunCommandWithRetries raise to make python happy.

Specifically, break it out into individual components so
that the VM doesn't try to reinstantiate the instance.

BUG=chromium-os:31113
TEST=Manual triggering of exceptions.

Change-Id: I9a9a9342f0ae5099a625c8a1c870a3984e51c0b8
Reviewed-on: https://gerrit.chromium.org/gerrit/23183
Commit-Ready: Brian Harring <fdc2d0a2e2340b623587cee5ea8dff425d1eb1f3@chromium.org>
Reviewed-by: Brian Harring <fdc2d0a2e2340b623587cee5ea8dff425d1eb1f3@chromium.org>
Tested-by: Brian Harring <fdc2d0a2e2340b623587cee5ea8dff425d1eb1f3@chromium.org>

coreos/chromite,bpsinc-native/src_third_party_chromite,coreos/chromite,bpsinc-native/src_third_party_chromite,chadversary/chromiumos.chromite,chadversary/chromiumos.chromite,zhang0137/chromite,coreos/chromite,zhang0137/chromite,zhang0137/chromite,bpsinc-native/src_third_party_chromite