Complete dockerslicing.md
Complete dockerslicing.md

It mainly precises that all requirements were not synchronized over
the OPNFV projects in Danube and adds 2 OPNFV project poposals.

Change-Id: I2e89f9cdf3db58d41acaa31560232807988bd84a
Signed-off-by: Cédric Ollivier <d48310251a4a484d041bc5d09a9ac4d86d20f793@orange.com>

mywulin/functest,opnfv/functest,mywulin/functest,opnfv/functest