Rewrite relative urls in .gitmodules

Most of the project are not mirrored in github which raises lots of
issues when building ONAP doc from github.

Switching to urls makes more sens in that context and fix all these
issues.

Issue-ID: DOC-552

Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>
Change-Id: I6d68ea521e0ac7fa34fbd4d70bdb5adf88afd945
(cherry picked from commit acc16aff7501d7b488534fc6eed03c2b789e9142)
1 file changed