[build] Moved telemetry exit listener from process package into docker

[akokhan]

Signed-off-by: Andriy Kokhan akokhan@barefootnetworks.com

- What I did
Fixed build issue:

Step 10/14 : COPY ["supervisord.conf", "/etc/supervisor/conf.d/"]
 ---> 3f8d35e4c42b
Step 11/14 : COPY ["files/supervisor-proc-exit-listener", "/usr/bin"]
COPY failed: stat /var/lib/docker/tmp/docker-builder472950022/files/supervisor-proc-exit-listener: no such file or directory
[  FAIL LOG END  ] [ target/docker-sonic-telemetry.gz ]
slave.mk:525: recipe for target 'target/docker-sonic-telemetry.gz' failed

- How I did it
Moved telemetry process exit listener from the process package into Docker package

[akokhan]

@yozhao101 , @jleveque , please have a look

[yozhao101]

I will check it. Thanks.

[jleveque]

@akokhan: Thank you for the fix!