Added dependencies for lxml on Fedora
Added dependencies for lxml on Fedora

Change-Id: I59df32c7527e83578b56f4e0c73be441b33610f9

savinash47/openstack-doc-tools,openstack/openstack-doc-tools,openstack/openstack-doc-tools,savinash47/openstack-doc-tools,savinash47/openstack-doc-tools