fix(api): remove slug tarball info from app log

This information is useless to the user. Changing the language to bring it in line with the other
port default logs

Author: Matthew Fisher

rootfs/api/models/release.py

@@ -150,8 +150,7 @@ def get_port(self, routable=False):
                 return port
 
             if self.build.type == "buildpack":
-                msg = "Using default port 5000 for build pack image {}".format(self.image)
-                self.app.log(msg)
+                self.app.log('buildpack type detected. Defaulting to $PORT 5000')
                 return 5000
 
             # application has registry auth - $PORT is required