v22
testsuite: rename rootfs dir
testsuite: port test-dependencies to module-playground
testsuite: port modules-order-compressed to module-playground
testsuite: test builtin state
testsuite: port signature-check modules to module-playground
testsuite: add test for modprobe -R <builtin-module>
tools: add basic versions of insert and remove
testsuite: add more input cases to freadline_wrapped test
testsuite: improve coverage of shared/util.h