The patch adds ability to enable/disable salt-syndic
by changing the value with soft params.

Depends-on: Id97088e0a8c449c38943b8ceaa2111647fea19fc
Change-Id: I019fc1a08ae4781a1bfd39f39acf1d695691b997
Related-PROD: PROD-20579

The patch addes new metadata to configure syndic master. The master.yml
will consits of all relevant parameters required for syndic master of
masters configuration.

Change-Id: I75c274dda7ea7a388cfd5c0b3fa50e110f57a241
Related-PROD: PROD-16861