Mark as fixed the Jenkins slave adressing issue

Summary:
Jenkins now references the slaves through their hostnames,
which is resolved by Docker when containers are attached
to a network.

Ref T1424.

Fixed by 9fb9d7646a76 and 387dbb96eb3d.

Reviewers: dereckson

Reviewed By: dereckson

Maniphest Tasks: T1424

Differential Revision: http://devcentral.nasqueron.org/D1755