fstests: clean up open-coded golden output

Fix the handful of tests that open-coded 'QA output created by XXX'.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Chandan Babu R <chandanrlinux@gmail.com>
Reviewed-by: Allison Henderson <allison.henderson@oracle.com>
Signed-off-by: Eryu Guan <guaneryu@gmail.com>

tests/btrfs/006

@@ -9,7 +9,7 @@
 #
 seq=`basename $0`
 seqres=$RESULT_DIR/$seq
-echo "== QA output created by $seq"
+echo "QA output created by $seq"
 
 here=`pwd`
 tmp=/tmp/$$

tests/btrfs/006.out

@@ -1,4 +1,4 @@
-== QA output created by 006
+QA output created by 006
 == Set filesystem label to TestLabel.006
 == Get filesystem label
 TestLabel.006

tests/btrfs/012

@@ -15,7 +15,7 @@
 #
 seq=`basename $0`
 seqres=$RESULT_DIR/$seq
-echo "== QA output created by $seq"
+echo "QA output created by $seq"
 
 here=`pwd`
 tmp=/tmp/$$

tests/btrfs/012.out

@@ -1 +1 @@
-== QA output created by 012
+QA output created by 012

tests/generic/184

@@ -8,7 +8,7 @@
 #
 seq=`basename $0`
 seqres=$RESULT_DIR/$seq
-echo "QA output created by $seq - silence is golden"
+echo "QA output created by $seq"
 
 here=`pwd`
 tmp=/tmp/$$

tests/generic/184.out

@@ -1 +1 @@
-QA output created by 184 - silence is golden
+QA output created by 184