This change implements the new feature of VirtualMedia 1.4.0: custom TLS
certificates. Adding/listing/deleting/replacing certificates is supported,
but creating a CSR is not.
Change-Id: I30a5c673ab91486cafbe1383c5fe58142102a7c2
The size of main.py is going out of control, let's start using Flask
blueprints to split it into clear blocks.
Change-Id: I85e09eb9647e412a9dd36a166dcd5a38328b0c64