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pg_stat_activity: show NULL stmt start time for walsenders

Returning a non-NULL time is pointless, sinc a walsender is not aprocess that would be running normal transactions anyway, but the codewas unintentionally exposing the process start time intermittently,which was not only bogus but it also confused monitoring systems lookingfor idle transactions. Fix by avoiding all updates in walsenders.Backpatch to 11, where walsenders started appearing in pg_stat_activity.Reported-by: Tomas VondraDiscussion:https://postgr.es/m/20191209234409.exe7osmyalwkt5j4@development

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src/backend/access/transam
- xact.c

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`‎src/backend/access/transam/xact.c`

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Original file line number	Diff line number	Diff line change
`@@ -750,6 +750,13 @@ GetCurrentTransactionStopTimestamp(void)`
`750`	`750`	`void`
`751`	`751`	`SetCurrentStatementStartTimestamp(void)`
`752`	`752`	`{`
	`753`	`+/*`
	`754`	`+ * Skip if on a walsender; this is not needed, and it confuses monitoring`
	`755`	`+ * if we publish non-NULL values.`
	`756`	`+ */`
	`757`	`+if (am_walsender)`
	`758`	`+return;`
	`759`	`+`
`753`	`760`	`if (!IsParallelWorker())`
`754`	`761`	`stmtStartTimestamp=GetCurrentTimestamp();`
`755`	`762`	`else`

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Commit896db77

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`‎src/backend/access/transam/xact.c`

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