[Integrated] RFR: Add --recurse-submodules=on-demand to git fetch commands

[Erik Helin]

Changeset: c96d768b
Author:    Erik Helin <ehelin at openjdk.org>
Date:      2019-10-25 13:24:53 +0000
URL:       https://git.openjdk.java.net/skara/commit/c96d768b

Add --recurse-submodules=on-demand to git fetch commands

Reviewed-by: rwestberg

! vcs/src/main/java/org/openjdk/skara/vcs/git/GitRepository.java