Add extra tags to sentry report.
Add extra tags to sentry report.

Extra tags:
 - server_full_name
 - environment
 - site

This those extra tags we will able to merge all Sentry apps into one for easier
managements on multiple clusters.

glogiotatidis/snippets-service,glogiotatidis/snippets-service,mozmar/snippets-service,mozilla/snippets-service,mozilla/snippets-service,mozilla/snippets-service,mozilla/snippets-service,glogiotatidis/snippets-service,glogiotatidis/snippets-service,mozmar/snippets-service,mozmar/snippets-service,mozmar/snippets-service