Unused imports, unused variables and such.
Initially, there were no functional changes, just to get rid of some standard CodeQL warnings.
I've then broken the CI, as apparently there's a install time(!?) Python script creation for the sole purpose of product
naming. I changed it - we have it in etcdir, as SCYLLA-PRODUCT-FILE.
So added (copied from a different script) a get_product() helper function in scylla_util.py and used it instead.
While at it, also fixed the too broad import from scylla_util, which 'forced' me to also fix other specific imports (such as shutil).
Improvement - no need to backport.
Signed-off-by: Yaniv Kaul <yaniv.kaul@scylladb.com>
Closesscylladb/scylladb#27883
Instead of lengthy blurbs, switch to single-line, machine-readable
standardized (https://spdx.dev) license identifiers. The Linux kernel
switched long ago, so there is strong precedent.
Three cases are handled: AGPL-only, Apache-only, and dual licensed.
For the latter case, I chose (AGPL-3.0-or-later and Apache-2.0),
reasoning that our changes are extensive enough to apply our license.
The changes we applied mechanically with a script, except to
licenses/README.md.
Closes#9937
