* Added debug symbol to dhcp-relay.
Note: Master is different; Hence explicitly for 201811 only.
* Include debug symbols of isc-dhcp in its debug docker.
Include isc-dhcp src in source archive.
- Found a bug in v4.3.1-6 in which dhcrelay would not start if
passed an interface name with a length of 15 characters due
to truncated copy of interface name in common/lpf.c.
Bug was fixed in v4.3.2.
- v4.3.3-6 is the newest version we can build for Debian Jessie, as all
newer versions require newer versions of debhelper and
libbind-export-dev dependencies than are available for Jessie.
* Add docker-dhcp-relay/Dockerfile to .gitignore
* Add isc-dhcp-relay .deb package to image build process, along with my Option 82 patch
* Install custom isc-dhcp-relay in dhcp_relay docker
* Install isc-dhcp-relay build dependencies in sonic-slave Docker container
* Copy the built .deb package to the destination directory
* Add dependencies for isc-dhcp-relay
* Change Option 82 string to '<hostname>:<portname>'
* Install dependencies of .deb files implicitly in Dockerfile
* Remove unused line
* Remove unnecessary space
