'ServerIdData' map actually returns 'None' ids for blacklisted
nodes for a role, as 'nova_server_resource' output is
evaluated with condition 'server_not_blacklisted'. This
results in get_server_names() returning these blacklisted
nodes with something like 'None: compute-1' and results
in issues when we write ansible_host_vars. As we don't intend to
write ansible_host_vars for blacklisted nodes, we can ignore
these from 'server_names'.
Closes-bug: #1856661
Change-Id: Iafecc885abac5583c07bc046bc4d541f5e1e1c00
(cherry picked from commit d407c96d17)
13b77d3670