Jenkins Wiki has been fully taken off line, so update the remaining
links to reference either the relevant plugin page or the github repo.
Add extlink target for repo in jenkinsci github org.
The sonatype-clm plugin seems to be more-or-less completely deprecated,
so update the description to indicate this and link to the
nexus-artifact-uploader plugin.
Update the jjb sphinx plugin so that it generates references for the
yamlfunctions.
Change-Id: If2241e751d01a60a8cb4cbaea5b3176aeb92eab4
Signed-off-by: Pat Long <pllong@arista.com>
d352ed9656