TT#23052 Use puppetlabs puppet repo instead of PC1

We are using puppet instead of PC1 since stretch so let's change it here
as well. It will work for jessie also.

Change-Id: Ied85ee1e8e36d1fc6b27ef1133721ec689084d6d

deployment.sh

@@ -2413,10 +2413,8 @@ EOF
   fi
 
   echo "Installing 'puppet-agent' with dependencies"
-
-  # puppetlabs hasn't provided packages for Debian Stretch yet
   cat >> ${TARGET}/etc/apt/sources.list.d/puppetlabs.list << EOF
-deb ${DEBIAN_REPO_TRANSPORT}://${DEBIAN_REPO_HOST}/puppetlabs/ ${DEBIAN_RELEASE} main PC1 dependencies
+deb ${DEBIAN_REPO_TRANSPORT}://${DEBIAN_REPO_HOST}/puppetlabs/ ${DEBIAN_RELEASE} main puppet dependencies
 EOF
 
   PUPPET_GPG_KEY="6F6B15509CF8E59E6E469F327F438280EF8D349F"