logging: set warning logging on svn import failure

vcsserver/http_main.py

@@ -153,7 +153,7 b' class VCS(object):'
             hg_factory = MercurialFactory()
             self._svn_remote = SvnRemote(svn_factory, hg_factory=hg_factory)
         else:
-            log.info("Subversion client import failed")
+            log.warning("Subversion client import failed")
 
         self._vcsserver = VcsServer()