Node Summary Dashboard: Add pt-summary output

UI part is in the linked ticket https://jira.percona.com/browse/PMM-3831

Problem:  we missing big part from pmm1  - when we were able to see results on pm-summary  output  (the tool form Percona toolkit) on PMM UI

This tool provides a lot of useful information regarding the system and parameters. We need to add this feature back 

 

 

User Stories: 

• As a PMM user, I need to be able to see the pt-summary output on Node Dashboard when Node selected, so that will provide me information about the node
• As a Percona Support  person, I need to be able to see  information from the pt-summary panel on Snapshot user uploaded  to our server, so that  I have full information about user system 

 

We need to include pt-summary to our PMM Client package to be able to call it from pmm-agent.