Remove unused file common/section_nova_cli_floatingip.xml

This is now covered by doc/user-guide/section_nova_cli_floating_ips.xml
and  doc/user-guide-admin/section_nova_cli_floating_ips.xml.

Change-Id: I2e1b48e6aabe5aaa6618ba36cf3f8789e5f8919f
Closes-Bug: #1233820
Include ML2 Neutron plug-in in the glossary

Fix bug# 1235998

Change-Id: I0196c690c0f6fa5719d79b0d07f17d0e3f98a502
Merge "Remove unused file common/section_nova_cli_floatingip.xml"
Merge "Include ML2 Neutron plug-in in the glossary"