dvc: Reduce import output verbosity (#2576)

Move some messages generated during import from
INFO to DEBUG log level.

Fixes #2489

dvc/scm/git/__init__.py

@@ -155,7 +155,7 @@ class Git(Base):
             return
 
         msg = "Adding '{}' to '{}'.".format(relpath(path), relpath(gitignore))
-        logger.info(msg)
+        logger.debug(msg)
 
         self._add_entry_to_gitignore(entry, gitignore)
 

dvc/stage.py

@@ -293,7 +293,7 @@ class Stage(object):
         if ret:
             logger.warning("Stage '{}' changed.".format(self.relpath))
         else:
-            logger.info("Stage '{}' didn't change.".format(self.relpath))
+            logger.debug("Stage '{}' didn't change.".format(self.relpath))
 
         return ret