Sort Agents, Nodes, and Services alphabetically by name in Inventory page

The problem: It's very unclear and hard to find needed Node or Service in Inventory page 

Proposed solution:

Add ordering in Inventory page:

• Services -  by Service Name 
• Agents - Agent type 
• Node  - Node name  

All ordering -  case-insensitive

Original report:  In PMM Inventory, in Services or Nodes tabs, hosts are ordered by ID. But this is a random value and so it's hard to find necessary server. Should be better ordered by Server name column.