Use connection keep-alive

Do not forcefully close the connection after every request. This enables
HTTP connection keep-alive, also known as persistent TCP and TLS/SSL
connection. Keep-alive speed up consecutive HTTP requests by 15% (for
local, low-latency network connections to a fast server) to multiple
times (high latency connections or remote peers).

https://pagure.io/freeipa/issue/6641

Signed-off-by: Christian Heimes <cheimes@redhat.com>
Reviewed-By: Tomas Krizek <tkrizek@redhat.com>

ipalib/rpc.py

@@ -686,7 +686,7 @@ class KerbTransport(SSLTransport):
                 return self.parse_response(response)
         except gssapi.exceptions.GSSError as e:
             self._handle_exception(e)
-        finally:
+        except BaseException:
             self.close()
 
     if six.PY3: