Router crashes when deleting router connector with dropTcpConnections flag set to true

[ganeshmurthy]

This crash does not happen on main. It happens on the 2.7.0 release

[Current thread is 1 (Thread 0x7fe2b28006c0 (LWP 613364))]
(gdb) bt
#0  0x0000000000494367 in qdr_connection_process (conn=0x0)
    at /home/mick/latest/skupper-router/src/router_core/connections.c:346
#1  0x00000000004528a9 in on_activate (context=0x7fe294038388)
    at /home/mick/latest/skupper-router/src/adaptors/tcp/tcp_adaptor.c:281
#2  0x00000000004c32fd in qd_timer_visit ()
    at /home/mick/latest/skupper-router/src/timer.c:317
#3  0x00000000004c5cd5 in handle (qd_server=qd_server@entry=0x23c7930,
    e=e@entry=0x7fe28c12ea40, pn_conn=pn_conn@entry=0x0, ctx=ctx@entry=0x0)
    at /home/mick/latest/skupper-router/src/server.c:1016
#4  0x00000000004c6fa6 in thread_run (arg=0x23c7930)
    at /home/mick/latest/skupper-router/src/server.c:1170
#5  0x00007fe2c32346d7 in start_thread (arg=<optimized out>) at pthread_create.c:447
#6  0x00007fe2c32b860c in clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:78