Make --test-name repeatable
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Drop support for obsolete action kinds
In the pre-2017 adt-run CLI, --test-name (formerly --testname) and --override-control were position-sensitive and therefore needed to be represented as "actions", but in the autopkgtest CLI they're global options and do not need this special handling.
Prerequisite for #1015921.
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Make --test-name repeatable
Closes: #1015921