Fix incorrectly reported error return in info logging.

A return code of 1 from the archive-get was being logged as an error message at info level but otherwise worked correctly.

Also improve info messages when an archive segment is or is not found.

test/lib/pgBackRestTest/Module/Mock/MockArchiveTest.pm

@@ -162,6 +162,13 @@ sub run
         # Remove WAL
         storageTest()->remove("${strWalPath}/${strSourceFile}", {bIgnoreMissing => false});
 
+        #---------------------------------------------------------------------------------------------------------------------------
+        &log(INFO, '    get missing WAL');
+
+        $oHostDbMaster->executeSimple(
+            $strCommandGet . " ${strLogDebug} 700000007000000070000000 ${strWalPath}/RECOVERYXLOG",
+            {iExpectedExitStatus => 1, oLogTest => $self->expect()});
+
         #---------------------------------------------------------------------------------------------------------------------------
         &log(INFO, '    get first WAL');