WHAT:
GTM added for partnered satellites sign up pages
csp values were extended to make GTM work at all:
1. googletagmanager.com for GTM script
2. google-analytics.com for GA script
3. hash was added to avoid using 'unsafe-inline' value in 'script-src' directive
Also config flag for GTM id was added
WHY:
Marketing team needs GTM and GA for their campaigns
Change-Id: Ibb2ace737feb971dda6c191599d479fe4a7af332