Add an empty line separator to the shotgun2 report

Sometimes is hard to read shotgun2 report, especially when one of
the packages doesn't contain the changelog. This commit adds an
empty line separator in the report output.

Change-Id: I504dcfffed0f88c57aa9f1956abd173eb39d7262
Closes-Bug: #1548541

etc/report.yaml

@@ -11,6 +11,7 @@ dump:
         rpm -qa | \
         egrep 'fuel|astute|network-checker|shotgun' | \
         while read package; do
+          echo
           echo $package
           rpm -q --changelog $package | head -2
         done