Update network docs
Add sections for every possible network flavor(DEFAULT, IP_LESS_ROUTED, MAC_FILTERED, PHYSICAL_VLAN)and the corresponding figure.
Signed-off-by: Dimitris Aragiorgis <dimara@grnet.gr>
Update the documentation's images
update registration flow in astakos documentation
update snf-astakos documentation
Update plankton documentation
Update cyclades documentation
Add synnefo overview image in documentation
Fix astakos documentation images
Add Pithos+ docs.
rename snf-docs/ to docs/