Make pg_controldata report newest XID with valid commit timestamp

Previously pg_controldata didn't report newestCommitTs and this was
an oversight in commit 73c986a.

Also this patch changes pg_resetxlog so that it uses the same sentences
as pg_controldata does, regarding oldestCommitTs and newestCommitTs,
for the sake of consistency.

Back-patch to 9.5 where track_commit_timestamp was added.

Euler Taveira

Author: MasaoFujii

src/bin/pg_controldata/pg_controldata.c

@@ -273,6 +273,8 @@ main(int argc, char *argv[])
 		   ControlFile.checkPointCopy.oldestMultiDB);
 	printf(_("Latest checkpoint's oldestCommitTs:   %u\n"),
 		   ControlFile.checkPointCopy.oldestCommitTs);
+	printf(_("Latest checkpoint's newestCommitTs:   %u\n"),
+		   ControlFile.checkPointCopy.newestCommitTs);
 	printf(_("Time of latest checkpoint:            %s\n"),
 		   ckpttime_str);
 	printf(_("Fake LSN counter for unlogged rels:   %X/%X\n"),

src/bin/pg_resetxlog/pg_resetxlog.c

@@ -665,9 +665,9 @@ PrintControlValues(bool guessed)
 		   ControlFile.checkPointCopy.oldestMulti);
 	printf(_("Latest checkpoint's oldestMulti's DB: %u\n"),
 		   ControlFile.checkPointCopy.oldestMultiDB);
-	printf(_("Latest checkpoint's oldest CommitTs:  %u\n"),
+	printf(_("Latest checkpoint's oldestCommitTs:   %u\n"),
 		   ControlFile.checkPointCopy.oldestCommitTs);
-	printf(_("Latest checkpoint's newest CommitTs:  %u\n"),
+	printf(_("Latest checkpoint's newestCommitTs:   %u\n"),
 		   ControlFile.checkPointCopy.newestCommitTs);
 	printf(_("Maximum data alignment:               %u\n"),
 		   ControlFile.maxAlign);