Remove log collation

[randall]

This implements the deprecation noted in 26b3087

[zwoop]

Nicely done!

[randall]

[approve ci autest]

[zwoop]

This seems to cause serious problems, log rotation stops working, and I'm getting ASAN errors as well:

==27218==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x602000015d40 at pc 0x2b32d4cbc158 bp 0x2b32ddd2f2f0 sp 0x2b32ddd2f2e0
READ of size 4 at 0x602000015d40 thread T11 ([LOG_FLUSH])
    #0 0x2b32d4cbc157 in EventNotify::signal() /usr/local/src/trafficserver/src/tscore/EventNotify.cc:73
    #1 0x93386b in LogObject::_checkout_write(unsigned long*, unsigned long) /usr/local/src/trafficserver/proxy/logging/LogObject.cc:409
    #2 0x93aba8 in LogObject::force_new_buffer() /usr/local/src/trafficserver/proxy/logging/LogObject.h:250
    #3 0x93aba8 in LogObject::check_buffer_expiration(long) /usr/local/src/trafficserver/proxy/logging/LogObject.cc:762
    #4 0x93aba8 in LogObjectManager::check_buffer_expiration(long) /usr/local/src/trafficserver/proxy/logging/LogObject.cc:1067
    #5 0x8c50a4 in Log::periodic_tasks(long) /usr/local/src/trafficserver/proxy/logging/Log.cc:234
    #6 0x8c8910 in Log::flush_thread_main(void*) /usr/local/src/trafficserver/proxy/logging/Log.cc:1356
    #7 0x8d3a3c in LoggingFlushContinuation::mainEvent(int, void*) /usr/local/src/trafficserver/proxy/logging/Log.cc:285
    #8 0xeba16b in Continuation::handleEvent(int, void*) /usr/local/src/trafficserver/iocore/eventsystem/I_Continuation.h:190
    #9 0xeba16b in EThread::execute() /usr/local/src/trafficserver/iocore/eventsystem/UnixEThread.cc:318
    #10 0xeb4a7a in spawn_thread_internal /usr/local/src/trafficserver/iocore/eventsystem/Thread.cc:92
    #11 0x2b32d6801dd4 in start_thread (/lib64/libpthread.so.0+0x7dd4)
    #12 0x2b32d7536eac in __clone (/lib64/libc.so.6+0xfdeac)

0x602000015d40 is located 0 bytes to the right of 16-byte region [0x602000015d30,0x602000015d40)
allocated by thread T0 ([TS_MAIN]) here:
    #0 0x2b32d3d25368 in operator new[](unsigned long) (/lib64/libasan.so.4+0xe0368)
    #1 0x8c991e in Log::create_threads() /usr/local/src/trafficserver/proxy/logging/Log.cc:1023
    #2 0x8ca3ac in Log::init_when_enabled() /usr/local/src/trafficserver/proxy/logging/Log.cc:1007
    #3 0x8d2232 in Log::init(int) /usr/local/src/trafficserver/proxy/logging/Log.cc:980
    #4 0x4b8dc5 in main traffic_server/traffic_server.cc:1886
    #5 0x2b32d745b3d4 in __libc_start_main (/lib64/libc.so.6+0x223d4)