use GlobalForwardingRules().Get() when detected a global fw rule

[krzyzacy]

I feel like we can just change all ForwardingRule to GlobalForwardingRule... but, anyway, let me try to fix test first...

Still unsure why it works for prod though.

// Get: Returns the specified GlobalForwardingRule resource. Gets a list
// of available forwarding rules by making a list() request.
// For details, see https://cloud.google.com/compute/docs/reference/latest/globalForwardingRules/get
func (r *GlobalForwardingRulesService) Get(project string, forwardingRule string) *GlobalForwardingRulesGetCall {
	c := &GlobalForwardingRulesGetCall{s: r.s, urlParams_: make(gensupport.URLParams)}
	c.project = project
	c.forwardingRule = forwardingRule
	return c
}

/assign @MrHohn @rramkumar1

[MrHohn]

Looks good, let us know if the local test passes :)

[MrHohn]

I feel like we can just change all ForwardingRule to GlobalForwardingRule... but, anyway, let me try to fix test first...

I think this has the value, once we have L7 internal LB, forwarding rule might be regional.

[krzyzacy]

fixed tests

[MrHohn]

/lgtm
/approve

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