Store metric records in separate backed o=metric

[yurem]

Additionally we need to do:

1. Add upper level node ou=server_UUID to split data per servers to avoid collisions
2. Create server UUID at startup @jschristie @mbaser Do you have ideas about this?

[yurem]

Implemented in both oxAuth/oxTrust

[yurem]

@mbaser I added this update to setup o_metric.ldif and updated oxauth-static-conf.json We need to import this new LDIF and update migrator if needed.

Also there is one update which we need to apply when admin is using OpenLDAP. We need to add next line to ox-ldap.properties to give metric service right permissions to write into this new backend:

metric.bindDN: cn=directory manager,o=metric

By default metric services uses LDAP properties from ox-ldap.properties. But admin can override any property. In order to do this he should add same property with prefixmetrix. Example:

metric.maxconnections: 10

[yurem]

@natt-tester @sahiliamsso We need to check in 3.1.5 configuration load/reload from ox-ldap.properties because during work on this i changed these parts