Adjust log levels for cloud provider interface calls

[andrewsykim]

Signed-off-by: Andrew Sy Kim kiman@vmware.com

What this PR does / why we need it:
Increases log level for calling Instances() and Zones() interface, log warning for unsupported cloud provider features. For interfaces we know we support, that should be a higher log level (proposed 6 in this PR) and for unsupported interfaces we should log a warning.

IMO Info.V(1) is way too verbose for every time Instances() is called from the cloud provider controllers, for example this is what the logs look like using just --v=2

I0910 02:14:38.430932       1 cloud.go:101] Enabling Instances interface on vSphere cloud provider
I0910 02:14:38.431043       1 cloud.go:101] Enabling Instances interface on vSphere cloud provider
I0910 02:14:38.435543       1 instances.go:189] VM=423043aa-9350-db86-50a2-ee8f4fca1647 IsActive=true
I0910 02:14:38.435559       1 instances.go:158] instances.InstanceExistsByProviderID() CACHED with 423043aa-9350-db86-50a2-ee8f4fca1647
I0910 02:14:43.435717       1 cloud.go:101] Enabling Instances interface on vSphere cloud provider
I0910 02:14:43.435754       1 cloud.go:101] Enabling Instances interface on vSphere cloud provider
I0910 02:14:43.439921       1 instances.go:189] VM=423043aa-9350-db86-50a2-ee8f4fca1647 IsActive=true
I0910 02:14:43.439943       1 instances.go:158] instances.InstanceExistsByProviderID() CACHED with 423043aa-9350-db86-50a2-ee8f4fca1647
I0910 02:14:48.440090       1 cloud.go:101] Enabling Instances interface on vSphere cloud provider
I0910 02:14:48.440126       1 cloud.go:101] Enabling Instances interface on vSphere cloud provider
I0910 02:14:48.444040       1 instances.go:189] VM=423043aa-9350-db86-50a2-ee8f4fca1647 IsActive=true
I0910 02:14:48.444064       1 instances.go:158] instances.InstanceExistsByProviderID() CACHED with 423043aa-9350-db86-50a2-ee8f4fca1647

Which issue this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged): fixes #

Special notes for your reviewer:

Release note:

[andrewsykim]

/assign @dvonthenen

[davidvonthenen]

/lgtm
/approve

[k8s-ci-robot]

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