Raspberry pi2 search domain setting getting cleared out on reboot

1st off, ubuntu mate runs amazing on the raspberry pi2b.

i am having an issues in the corporate environment where i need to specify 2 Search domains. we will call them testnt1.local and test.org.

when i set them up using the network settings GUI, everything works fine, but when i reboot the 2nd entry (test.org) is gone.

as suggested from a search result (all be it for ubuntu 12.xx) i tried adding the line
search testnt1.local test.org
to /etc/dhcp/dhclient.conf and /etc/resolv.conf but to no avail i still have to manually add the test.org each time i reboot.

also note, when i add the test.org via the network settings gui i notice it appears in the /etc/resolv.conf file, however the changes do not stick and are overwritten on reboot.

does anyone know a way to make this 2nd search domain stick?

any help would be much appreciated.