Revert "varnish/vhost.vcl.erb: Replace Regexp.replace with String.gsub"
Revert "varnish/vhost.vcl.erb: Replace Regexp.replace with String.gsub"

This reverts commit 6b58e734e61f6010beb9f9e708022d01176573d1.

SoftwareHeritage/puppet-swh-site,SoftwareHeritage/puppet-swh-profile,SoftwareHeritage/puppet-swh-profile,SoftwareHeritage/puppet-swh-profile,SoftwareHeritage/puppet-swh-profile,SoftwareHeritage/puppet-swh-site,SoftwareHeritage/puppet-swh-profile,SoftwareHeritage/puppet-swh-site,SoftwareHeritage/puppet-swh-site,SoftwareHeritage/puppet-swh-site