Unify metrics names

[bubble75]

Otherwise it is very hard to get overall picture on resources states - both groups and clones may not present in a given cluster, making it very hard to do arithmetics with NA vectors in prometheus.

[coveralls]

Pull Request Test Coverage Report for Build 18

• 0 of 14 (0.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 2.436%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
collector/crm_mon.go	0	14	0.0%
<!--	Total:	0	14	0.0%	-->

Totals
Change from base Build 17:	0.0%
Covered Lines:	42
Relevant Lines:	1724

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💛 - Coveralls

[mjtrangoni]

Hi @bubble75 ,

Can you please put here an example of how it looks like before and after the change?

[bubble75]

Now it looks like (metrics are synthetic):

pacemaker_resource_active{group_id="mygroup",id="group_res1",node_name="node01",resource_agent="ocf::pacemaker:Dummy",role="Started",target_role="Started"} 1
pacemaker_resource_active{group_id="mygroup",id="group_res2",node_name="node01",resource_agent="ocf::pacemaker:Dummy",role="Started",target_role="Started"} 1
pacemaker_resource_active{clone_id="myclone",id="clone_res",node_name="node01",resource_agent="ocf::pacemaker:Dummy",role="Started",target_role="Started"} 1
pacemaker_resource_active{id="myres",node_name="node01",resource_agent="ocf::pacemaker:Dummy",role="Started",target_role="Started"} 1

Before this PR output was:

pacemaker_group_resource_active{group_id="mygroup",id="group_res1",node_name="node01",resource_agent="ocf::pacemaker:Dummy",role="Started",target_role="Started"} 1
pacemaker_group_resource_active{group_id="mygroup",id="group_res2",node_name="node01",resource_agent="ocf::pacemaker:Dummy",role="Started",target_role="Started"} 1
pacemaker_clone_resource_active{clone_id="myclone",id="clone_res",node_name="node01",resource_agent="ocf::pacemaker:Dummy",role="Started",target_role="Started"} 1
pacemaker_resource_active{id="myres",node_name="node01",resource_agent="ocf::pacemaker:Dummy",role="Started",target_role="Started"} 1

[mjtrangoni]

@bubble75 Thanks for contributing!