[INSTRM-1915] load per-site configuration file

Fri, 31 Mar 2023 17:00:17 +0000

Right now, we can deal with different site inside the same config file but as the configuration grows it can become messy.
It'd be cleaner to be able to load per-site configuration file.
We just a need to add some logic :
The config file name is $PRODUCTNAME.yaml, but if there is a config file named $PRODUCTNAME$SITE.yaml_, (for example: drp_L.yaml)
then you load this one.

PFS-JIRA

[INSTRM-1915] load per-site configuration file