Moving all the container environments from lists to dicts, so they can
be consumed later by the podman_container ansible module which uses
dict.
Using a dict is also easier to parse, since it doesn't involve "=" for
each item in the environment to export.
Change-Id: I894f339cdf03bc2a93c588f826f738b0b851a3ad
Depends-On: I98c75e03d78885173d829fa850f35c52c625e6bb
81258ae551