Tests: skip some of TLS reconfiguration tests under AddressSanitizer

These tests cause router crash when run with AddressSanitizer:

=================================================================
==77196==ERROR: AddressSanitizer: heap-use-after-free on address 0x60c000079340 at pc 0x55d56b132d4b bp 0x7f8cc7f346b0 sp 0x7f8cc7f346a0
READ of size 1 at 0x60c000079340 thread T1
    #0 0x55d56b132d4a in nxt_openssl_conn_io_shutdown src/nxt_openssl.c:1466
    #1 0x55d56b0f6a25 in nxt_h1p_closing src/nxt_h1proto.c:2069
    #2 0x55d56b1009a6 in nxt_h1p_shutdown src/nxt_h1proto.c:2038
    #3 0x55d56b1014c3 in nxt_h1p_request_close src/nxt_h1proto.c:1718
    #4 0x55d56b1045c0 in nxt_http_request_close_handler src/nxt_http_request.c:864
    #5 0x55d56b104988 in nxt_http_request_done src/nxt_http_request.c:795
    #6 0x55d56b0ba0c3 in nxt_event_engine_start src/nxt_event_engine.c:542
    #7 0x55d56b0dcac2 in nxt_router_thread_start src/nxt_router.c:3645
    #8 0x55d56b0b421b in nxt_thread_trampoline src/nxt_thread.c:126
    #9 0x7f8ccab95ac2  (/lib/x86_64-linux-gnu/libc.so.6+0x94ac2)
    #10 0x7f8ccac2784f  (/lib/x86_64-linux-gnu/libc.so.6+0x12684f)

test/test_reconfigure_tls.py

@@ -5,6 +5,7 @@
 import pytest
 
 from unit.applications.tls import ApplicationTLS
+from unit.option import option
 
 prerequisites = {'modules': {'openssl': 'any'}}
 
@@ -70,6 +71,9 @@ def test_reconfigure_tls_switch():
 
 
 def test_reconfigure_tls():
+    if option.configure_flag['asan']:
+        pytest.skip('not yet, router crash')
+
     ssl_sock = create_socket()
 
     ssl_sock.sendall("""GET / HTTP/1.1\r\n""".encode())
@@ -107,6 +111,9 @@ def test_reconfigure_tls_2():
 
 
 def test_reconfigure_tls_3():
+    if option.configure_flag['asan']:
+        pytest.skip('not yet, router crash')
+
     ssl_sock = create_socket()
     ssl_sock.do_handshake()