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Add functionality to detect environment variables in template files.
The variables that can be set by the user through --set is displayed
on 'atomic images info'. The variables with overridable default
values will either have their default value displayed, or shown as
{SET_BY_OS} if atomic sets them. Variables without default value
must be set by the user and is listed separately.
Currently install --system already checks for variables that have no
value after install, and will error out.
Signed-off-by: Yu Qi Zhang <jerzhang@redhat.com>
Closes: #752
Approved by: giuseppe