telegraf filestat: replace wildcards with full paths
On Rosetta, I monitor which batch processes are running by using the
filestat plugin watching the presence of lock files.
If I watch *.php.lock, then if foo.php.lock exists it gets logged as
exists=1, but if it doesn't exist it doesn't get logged at all.
Also, if nothing matching the wildcard exists, it gets logged as
"path=*.php.lock exists=0". It's annoying that there is never a
"path=foo.php.lock exists=0" ever logged this way.
I'm now listing explicitly the three PHP lock files I'm interested in.