Fixing a couple of typos

Nothing fancy, just a couple of typos I spotted in logging and exception messages.

Author: dregin

src/etcd/client.py

@@ -228,7 +228,7 @@ def _discover(self, domain):
                 (answer.target.to_text(omit_final_dot=True), answer.port))
         _log.debug("Found %s", hosts)
         if not len(hosts):
-            raise ValueError("The SRV record is present but no host were found")
+            raise ValueError("The SRV record is present but no hosts were found")
         return tuple(hosts)
 
     def __del__(self):
@@ -818,7 +818,7 @@ def _result_from_response(self, response):
 
     def _next_server(self, cause=None):
         """ Selects the next server in the list, refreshes the server list. """
-        _log.debug("Selection next machine in cache. Available machines: %s",
+        _log.debug("Selecting next machine in cache. Available machines: %s",
                    self._machines_cache)
         try:
             mach = self._machines_cache.pop()