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
by setting _alloc_count initially to 0.
The _alloc_count hasn't been explicitely specified. As the allocator has
been usually an automatic variable, _alloc_count had initially some
unspecified contents. This probalby means that cases where the first few
allocations passed and the later one failed, might haven't ever been
tested. Good thing is that most of the users have been transferred to
the Seastar failure injector, which (by accident) has been correct.
Closes#9420
The plan is to move the unstructured content of tests/ directory
into the following directories of test/:
test/lib - shared header and source files for unit tests
test/boost - boost unit tests
test/unit - non-boost unit tests
test/manual - tests intended to be run manually
test/resource - binary test resources and configuration files
In order to not break git bisect and preserve the file history,
first move most of the header files and resources.
Update paths to these files in .cc files, which are not moved.
