wildfly: Perform chown in same step as untar, to save 100Mb

To reduce the size of the wildfly image, perform the chown for
all extracted files from the downloaded tar file in the same RUN
step as the extract. This avoids that the final image contains
the extracted tar file content twice.

So the size goes from 1Gb to 900Mb
Merge pull request #31 from alfh/master

wildfly: Perform chown in same step as untar, to save 100Mb