Do not fail if the projects.ini file has no rdoinfo_driver section
Do not fail if the projects.ini file has no rdoinfo_driver section

https://softwarefactory-project.io/r/11446 added a new section to
the projects.ini file (rdoinfo_driver). If this section is not
present in the config file, dlrn can fail when trying to find
config_options.rdoinfo_repo, because it is not defined.

Change-Id: I9986089424f9e8808f4ae28a0de9dda95be8fe94

openstack-packages/delorean,openstack-packages/DLRN,openstack-packages/delorean,openstack-packages/DLRN