Merge branch 'validation_timeout' into devel

docs/acme_srv.md

@@ -20,6 +20,7 @@
 | `Challenge` | `challenge_validation_disable` | disable challenge validation via http or dns. THIS IS A SEVERE SECURITY ISSUE! Please enable for testing/debugging purposes only. | True/False | False|
 | `Challenge` | `challenge_validation_timeout` | Timeout in seconds for challenge validation | Integer | 10 |
 | `Challenge` | `dns_server_list` | Use own dns servers for name resolution during challenge verification| ["ip1", "ip2"] | []|
+| `Challenge` | `dns_validation_pause_timer ` | pause interval in seconds after failed validation of a dns challenge | 10 | 0.5 |
 | `Challenge` | `sectigo_sim` | provide `sectigo-email-01` challenges - Only for development and testing! | True/False | False |
 | `DBhandler` | `dbfile` | path and name of database file. If not specified `acme_srv/acme_srv.db` will be used. Parameter is only available for a wsgi handler and will be ignored if django handler is getting used | 'acme/database.db' | `acme_srv/acme_srv.db`|
 | `Directory` | `db_check` | check database connection compare schemes and report as OK/NOK in meta information  | True/False | False|