rpm_verify: reduce verbosity, and at the same time print more info on error

rpm_verify

@@ -9,7 +9,7 @@ if ! [ -f $RPM ]; then
 fi
 
 if ! rpm --checksig $RPM > /dev/null; then
-    echo "Wrong PGP signature!"
+    echo "Wrong PGP signature on $RPM!"
     exit 1
 fi
 
@@ -38,7 +38,6 @@ if [ $# -lt 1 ]; then
 fi
 
 for FILE in "$@"; do
-        echo -n "Veryfing: $FILE... "
-        verify_rpm $FILE && echo OK.
+        verify_rpm $FILE || exit 1
 done