Revert two commits as an attempt to avoid crash

Revert two commits as an attempt to avoid crash

This reverts following two commits.

    "wayland-client: Delete pthread_key before iterating thread_data"
    commit c4a2e5dbe2d6d371de814c24b578e9d3196ec971.

    "wayland-client: Destroy all thread data on disconnect"
    commit d5f09227a4d62c48ade0905be13b4645fde02cd0.

And this is the backtrace.

    (gdb)bt full
    0  0xb56937f8 in wl_list_remove (elm=elm@entry=0xa40520) at
    /usr/src/debug/wayland-1.20.0/builddir/../src/wayland-util.c:67
    No locals.
    1  0xb5693a86 in destroy_thread_data (data=0xa40520) at
    /usr/src/debug/wayland-1.20.0/builddir/../src/wayland-client.c:1195
            display = 0x913d80
            thread_data = 0xa40520
            __PRETTY_FUNCTION__ = "destroy_thread_data"
    2  0xb5e1634c in __nptl_deallocate_tsd () at
    /usr/src/debug/glibc-2.30/nptl/pthread_create.c:301
            data = <optimized out>
            inner = <optimized out>
            level2 = 0x9b9731ac
            idx = <optimized out>
            round = 0
            cnt = <optimized out>
            self = 0x9b973120
    3  0xb5e164d4 in start_thread (arg=0x9b973120) at
    /usr/src/debug/glibc-2.30/nptl/pthread_create.c:490
            pd = 0x9b973120
            unwind_buf = {cancel_jmp_buf = {{jmp_buf = {1530611246,
    1967982998, -1684590304, -1552949728, -1552943648, 338, -1552949818, 0,
    -1684590304, -1684591524, 0 <repeats 54 times>}, mask_was_saved = 0}},
    priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0,
    canceltype = 0}}}
            not_first_call = <optimized out>
    4  0xb5f3c988 in __inet_pton_length () at
    /usr/src/debug/glibc-2.30/misc/../sysdeps/unix/sysv/linux/arm/clone.S:73
    No locals.
    5  0x00000000 in ?? ()

Not sure this crash happened because of the patches to be reverted but
let just the leak happen and let's see if crash happen again.

Change-Id: I478fe965ae5b633039b31e103203c733948abda1