Fix bug 1636: remove the default 30s timeout in retry

Change-Id: Ie6094ebb91d32c1dcb63dc718f4dbeaf2e07adda
Signed-off-by: David Garcia <david.garcia@canonical.com>
diff --git a/n2vc/n2vc_juju_conn.py b/n2vc/n2vc_juju_conn.py
index 2c94328..dc4f883 100644
--- a/n2vc/n2vc_juju_conn.py
+++ b/n2vc/n2vc_juju_conn.py
@@ -369,7 +369,7 @@
 
     # In case of native_charm is being deployed, if JujuApplicationExists error happens
     # it will try to add_unit
-    @retry(attempts=3, delay=5, retry_exceptions=(N2VCApplicationExists,))
+    @retry(attempts=3, delay=5, retry_exceptions=(N2VCApplicationExists,), timeout=None)
     async def install_configuration_sw(
         self,
         ee_id: str,