Increase angular digest iteration limit
Increase angular digest iteration limit

Default iteration limit is set to 10.
Increase limit to 50 will display traces more than 10 levels.

Why?
Because some trace outputs by heat, magnum, nova
have depth from 15 to 35 (so insane).

Limit to 10: https://tovin07.github.io/cluster-create-with-default-iteration-limit.html
Limit to 50: https://tovin07.github.io/cluster-create-with-50-iteration-limit.html

Reference: https://docs.angularjs.org/api/ng/provider/$rootScopeProvider

Change-Id: Ib83a8db570485af72c0875aad7d6b944210a7b68

openstack/osprofiler,openstack/osprofiler,stackforge/osprofiler,stackforge/osprofiler,openstack/osprofiler,stackforge/osprofiler