Can we generalize this a bit? As of now, this script is very
non-OpenWhisk-dependent. What about:
```bash
if [ -n "$CONFIGFILE_CONTENT" ]
then
location="/config.conf"
echo "$CONFIGFILE_CONTENT" > "$location"
props+=("-Dconfig.file='$location'")
fi
```
Note: I switched from `printf` to `echo`. Any reason to use `printf` here?
Note 2: Please fix the indenting from 3 to 4 spaces.
[ Full content available at:
https://github.com/apache/incubator-openwhisk/pull/3984 ]
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