[WIP] Integrate Docker and Singularity flags

[davidjurado]

This PR integrates the following new flags into MLCube:

Description	Docker Flag	Singularity Flag	MLCube Flag
Network acess	--network	--net	--network
Security	--security-opt	--security	--security
Gpus	--gpus	--nv	--gpus
Ram	--memory	--vm-ram	--memory
Cpu	--cpu-shares	--vm-cpu	--cpu

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[dfeddema]

I would like to test this with podman before we merge.