* document ProgramTest::new
* simplify ProgramTest::new doc-string
* make ProgramTest::add_program noisier
`add_program` (and `new`, implicitly) now prints a warning when the user
supplies a bogus program name to a ProgramTest and invokes `test-bpf`.
Additionally, it is now impossible to ask for a regular `test` and for
the generated ProgramTest to load BPF code instead of native code.
Previously, this was caused by a precedence issue: BPF code would always
be preferred over native if the program name was valid, regardless of
user choice.
(cherry picked from commit 2aaf55795f)
Co-authored-by: xuoe <alex@psi.io>
6d5a4b5cce