I'm using Consul in combination with a service registration framework 
(progrium/registrator Docker image) to play around with distributed service 
discovery. Plus Ansible to start up my Docker containers, etc. However I'm 
running into a limitation with the 'env' option of the Docker module. The 
registration framework can allow me to set multiple 'tags' for a service, 
but requires them to be expressed as a single environment variable with 
comma-separate values, eg.

env="SERVICE_80_TAGS=master,http"

of course, this falls over because the Docker module is expecting multiple 
environment variables to be comma separated;

env="SOME_ENV_A=valueA,SOME_ENV_B=valueB"

Can I get this to work with escaping, or would it be possible to support an 
alternative separator in env?

env="SERVICE_80_TAGS=master,http:SOME_ENV_A=valueA:SOME_ENV_B=valueB"

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