devel/tevent017: Update to 0.17.0

• Lint with portclippy and portfmt.
• Drop NO_COLORS-related bits. The port builds just fine, so remove this bit of documented magic.
• Update CONFLICTS_INSTALL in other tevent ports.
• Drop files/patch-buildtools_wafsamba_samba__autoconf.py, which does not apply cleanly anymore. It seems harmless.

PR: 287985
Reported by: Andrej Ebert <andrej@ebert.su>
Sponsored by: Klara, Inc.