Issue in dhclient -x option

[Rathnakar, Dilip]

Hi,

As per dhclient (isc-dhclient-4.4.1) man-page, the "dhclient -x" option should do the following:
"Stop the running DHCP client without releasing the current lease. Kills existing dhclient process as previously recorded in the PID file. When shutdown via this method dhclient-script will be executed with the specific reason for calling the script set."

However, this is not working as expected. It is sending a DHCP release packet during exit.

Steps to reproduce the behaviour:
1. Start dhclient using: "dhclient -d -q  -cf /var/db/dhclient-eth0.conf -lf /var/db/dhclient-eth0.leases -pf /var/db/dhclient-eth0.pid eth0"
2. Ensure dhclient process is running and IP address is acquired.
3. Stop dhclient using: "dhclient -x -pf /var/db/dhclient-eth0.pid -lf /var/db/dhclient-eth0.leases eth0"
4. Observe release packet in wireshark.


**Expected behavior**
Should stop running of DHCP client without releasing the current lease. (No Release packet should be sent)

**Actual behavior***
Release packet sent.

**Environment:**
- ISC DHCP version: isc-dhclient-4.4.1
 - OS: Ubuntu 16.04

Is this a known issue or is there a workaround for this?
Any inputs would be appreciated.

Thanks,
Dilip
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