This change adds initial metrics for Ironic based on new support in
ironic-lib. Emits timing metrics for basic Ironic API calls.
Bumps ironic-lib to 2.0.0 in requirements to add metrics support, as
well as adding ironic_lib.metrics and ironic_lib.metrics_statds to
ironic-config-generator.conf to get them in the sample config, which
is also regenerated.
Change-Id: Ic35802e4cd11763ebbedb8ddc28f7e8dc535cc2f
Partial-bug: #1526219