Scripts are the core of Magnum for COE deployment. To be more
clear and consistent, two changes proposed in this patch:
1. Rename network related script to xxx-flannel-xxx given they
are all for flannel and now we have calico driver.
2. Adding .sh for some scripts to be consistent with others.
Change-Id: I97f3e53b4b43648a4896193fb4ce469dbf42c611