mmapstorage: fix shelltest cleanup and docs
This file contains important shell tests for mmapstorage which
do not fit well into the plugin README.
-# Test kdb export & import (pipe size known)
+# Test kdb export & import (stat: pipe size known)
```sh
# Make temp file
@@ -62,9 +62,10 @@ sudo kdb umount user/tests/mmapstorage
# Remove temp file
rm $(kdb get system/tests/mmaptempfile)
+kdb rm -r system/tests/mmaptempfile
```
-# Test kdb export & import (pipe size unknown)
+# Test kdb export & import (stat: pipe size unknown)
```sh
# Make temp file
@@ -123,4 +124,5 @@ sudo kdb umount user/tests/mmapstorage
# Remove temp file
rm $(kdb get system/tests/mmaptempfile)
+kdb rm -r system/tests/mmaptempfile
```
