Update "Developer Quick-Start" guide for Fedora 23+
Update "Developer Quick-Start" guide for Fedora 23+

This patch is updating the "Developer Quick-Start" guide to instruct
people using Fedora 23+ to install a package called "redhat-rpm-config".
This is needed to build a virtualenv for development successfully.

Closes-Bug: #1527614
Change-Id: I95c927330faea009b327492a3884e01b9c44606d

dims/ironic,ionutbalutoiu/ironic,devananda/ironic,ionutbalutoiu/ironic,NaohiroTamura/ironic,bacaldwell/ironic,NaohiroTamura/ironic,SauloAislan/ironic,openstack/ironic,dims/ironic,pshchelo/ironic,pshchelo/ironic,SauloAislan/ironic,openstack/ironic,bacaldwell/ironic