[Rule Tuning] 7.11.2: Add timestamp_override to all query and non-sequence EQL rules (#948)

* [Rule Tuning] Add timestamp_override field to 7.11.0 rules
* Lock versions for 7.11.2 rules

rules/linux/execution_python_tty_shell.toml

@@ -1,7 +1,7 @@
 [metadata]
 creation_date = "2020/04/15"
 maturity = "production"
-updated_date = "2020/11/03"
+updated_date = "2020/02/16"
 
 [rule]
 author = ["Elastic"]
@@ -18,6 +18,7 @@ risk_score = 73
 rule_id = "d76b02ef-fc95-4001-9297-01cb7412232f"
 severity = "high"
 tags = ["Elastic", "Host", "Linux", "Threat Detection", "Execution"]
+timestamp_override = "event.ingested"
 type = "query"
 
 query = '''