Explicit model-registry proxy MLMD gRPC port param

[tarilabs]

Resolves #26

Description

Without explicit params the deployed MR would try to connect to MLMD gRPC to localhost:8081
See: https://github.com/opendatahub-io/model-registry/blob/04aa36605d43a9884b06fb9cd68ce46a14b6b717/cmd/proxy.go#L77-L80

AFTER

Now connects to port 9090 accounting for template values:

How Has This Been Tested?

Ad-hoc built operator in another quay organization and deployed with this change.
Deploys as expected:

NOTE: notice the I1113 10:05:11.181255 1 proxy.go:34] MLMD server localhost:9090 line, to connect to the expected defaults.

Manually created OCP Route (accounting for #19 by defining it manually):

Then can be used:

Merge criteria:

• The commits and have meaningful messages; the author will squash them after approval or will ask to merge with squash.
• Testing instructions have been added in the PR body (for PRs involving changes that are not immediately obvious).
• The developer has manually tested the changes and verified that the changes work

[dhirajsb]

/lgtm