Begin adding tests for DOML v2.1.

mc_openapi/doml_mc/example_faas.ipynb

mc_openapi/doml_mc/example_nginx.ipynb

mc_openapi/doml_mc/test.ipynb

tests/doml/v2.0/faas.domlx

tests/doml/v2.0/nginx-openstack_v2.0.domlx

...openstack_v2.0_wrong_all_SoftwareComponents_deployed.doml

...penstack_v2.0_wrong_all_SoftwareComponents_deployed.domlx

...ginx-openstack_v2.0_wrong_all_concrete_map_something.doml

...inx-openstack_v2.0_wrong_all_concrete_map_something.domlx

...tack_v2.0_wrong_all_infrastructure_elements_deployed.doml

...ack_v2.0_wrong_all_infrastructure_elements_deployed.domlx

tests/doml/v2.0/nginx-openstack_v2.0_wrong_iface_uniq.doml

tests/doml/v2.0/nginx-openstack_v2.0_wrong_iface_uniq.domlx

...ginx-openstack_v2.0_wrong_software_package_iface_net.doml

...inx-openstack_v2.0_wrong_software_package_iface_net.domlx

tests/doml/v2.0/nginx-openstack_v2.0_wrong_vm_iface.doml

tests/doml/v2.0/nginx-openstack_v2.0_wrong_vm_iface.domlx

tests/doml/v2.1/faas.domlx

tests/doml/v2.1/nginx-aws-ec2.domlx

tests/test_mc_openapi.py