qa/876 and qa/1153: F38 requires xfs FS to be at least 300MB

Not sure why (the xfs decision), but this was causing qa/876
and qa/1153 to fail on vm22.

Fix for qa/1153 is in _mount_filesystem() in common.bcc where we also
don't throw the output from mkfs.* away any more so it is easier to
debug this sort of thing.

qa/876

@@ -66,7 +66,7 @@ trap "_cleanup; exit \$status" 0 1 2 3 15
 
 # real QA test starts here
 echo "creating a filesystem"
-mkfs.xfs -dfile,size=256m,name=$tmp.xfsfile > /dev/null || exit 1
+mkfs.xfs -dfile,size=350m,name=$tmp.xfsfile > /dev/null || exit 1
 
 echo "creating a mount point"
 mkdir -p $tmp.xfsmount || exit 1

qa/common.bcc

@@ -247,8 +247,8 @@ _mount_filesystem()
     __image=$tmp.loop.$__fs.img
     __mountpoint=$tmp.mount.$__fs
 
-    truncate -s 30M $__image
-    echo y | mkfs.$__fs $__image > /dev/null 2>&1
+    truncate -s 350M $__image
+    echo y | mkfs.$__fs $__image >>$here/$seq.full 2>&1
     mkdir -p $__mountpoint
     $sudo mount -t $__fs $__image $__mountpoint
     $sudo chown $(id -u):$(id -g) $__mountpoint