ci: speed up code-coverage jobs

Plus some documentation updates

Change-Id: I6fd2b04e22bca6c3d6e36e78d1995220e261206b
Refs: #3809
diff --git a/docs/tutorials/security-validator-config.rst b/docs/tutorials/security-validator-config.rst
index aec8d7d..9df0020 100644
--- a/docs/tutorials/security-validator-config.rst
+++ b/docs/tutorials/security-validator-config.rst
@@ -578,7 +578,7 @@
 Example Configuration For NFD RIB Management
 --------------------------------------------
 
-Assume `NFD RIB Management <http://redmine.named-data.net/projects/nfd/wiki/RibMgmt>`_
+Assume `NFD RIB Management <https://redmine.named-data.net/projects/nfd/wiki/RibMgmt>`_
 allows any valid testbed certificate to register prefix, the configuration file could be
 written as: