cmake: propagate UBsan option to LuaJIT build The commit bf01fb200777 ("luajit: bump new version") introduced the LUAJIT_USE_UBSAN option in LuaJIT. The patch propagates the CMake option ENABLE_UB_SANITIZER used in Tarantool to the LuaJIT build. Needed for #10145 NO_CHANGELOG=build NO_DOC=build NO_TEST=build (cherry picked from commit b58791cf532c5a76a6941221358ca007bc97a85b)

varbinary: fix UB in a varbinary.new() With enabled UndefinedBehavior Sanitizer runtime error like below is triggered: NO_WRAP $ UBSAN_OPTIONS=external_symbolizer_path=/usr/lib/llvm-13/bin/llvm-symbolizer:print_stacktrace=1 $ ./build/src/tarantool -e "require('varbinary').new()" /home/sergeyb/sources/MRG/tarantool/third_party/luajit/src/lib_ffi.c:710:14: \ runtime error: null pointer passed as argument 2, which is declared to never be null /usr/include/string.h:44:28: note: nonnull attribute specified here NO_WRAP This happened because in the varbinary constructor, the NULL pointer was passed to `ffi.copy()` and then to `memcpy()`, which is an undefined behaviour. The patch fixes that. Needed for #10145 NO_CHANGELOG=codehealth NO_DOC=codehealth NO_TEST=codehealth (cherry picked from commit 30179d44da65f835d81494ad63e86935f1c5aad0)

doc: fix tt start command in --help Fixes #10563 NO_DOC=The documentation on the website has correct command, this is a purely --help output problem. NO_CHANGELOG=This commit is not related to tarantool's behavior or public APIs. (cherry picked from commit 22e86d2ed3f5f36099cf143868619d1f0df611ac)

test: disable flaky testcases in http_client_test The testcase "http_client.sock_family:\"AF_UNIX\".test_follow_location" is flaky in each run of `release_clang_asan` and `debug_asan_clang` workflows. Disabling a single testcase does not help. The patch disables a group of testcases executed with Unix domain socket. Needed for #9854 NO_CHANGELOG=testing NO_DOC=testing (cherry picked from commit 8fae8004f79ecd555537960c60c6e646b037c4cc)

test: fix luacheck warnings The patch fixes a warning produced by luacheck: NO_WRAP test/app-luatest/http_client_test.lua:27:8: Error prone negation: negation is executed before relational operator. test/app-luatest/http_client_test.lua:28:8: Error prone negation: negation is executed before relational operator. NO_WRAP Found by Luacheck 1.2.0. Closes #10037 NO_CHANGELOG=codehealth NO_DOC=codehealth NO_TEST=codehealth (cherry picked from commit 8fd37731b68e1e1d8e258ab919d65907d52ec764)