PMM Inventory: PMM Server is considered a generic type although it is a docker container

User Impact:

During testing of the new PMM inventory I've notice that PMM-Server is considered to be generic type although it is running as a docker container 

Steps to Reproduce:
#1 Run PMM as a docker container 
#2 register pmm-client to pmm-server
#3 Navigate to pmm inventory and check the column Node Type

Actual Result:

Expected Result:
I would expect the PMM-Server to be of Node Type container