VOL-2642 Add a Makefile, tests, and virtualenv

Convert common python and robot into a CORDRobot python module that can
be installed via standard python tools (pip) and from PyPI

Uses a fork of https://github.com/rasjani/robotframework-importresource,
which has been backported to Python 3.5 (used in Ubuntu 16.04
executors).

Reformatted and moved keywords so resource files are scoped to a
specific topic.

Added tox tests for library consistency

- flake8
- pylint
- robotframework-lint
- Ran robot against installed library to verify it can be loaded and
  used

Added basic lint and tests to whole repo

Removed old tests:

- CORD <6.x era: SanityPhyPOD.robot, and onosUtils.py

Change-Id: I61265a9fb04034a086e20be1f7236a8793a218aa
diff --git a/cord-robot/CORDRobot/rf-resources/DHCP.resource b/cord-robot/CORDRobot/rf-resources/DHCP.resource
new file mode 100644
index 0000000..feb1cbb
--- /dev/null
+++ b/cord-robot/CORDRobot/rf-resources/DHCP.resource
@@ -0,0 +1,72 @@
+# Copyright 2017-present Open Networking Foundation
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+*** Settings ***
+Documentation     Library for DHCP server and client functions
+Library           OperatingSystem
+Resource          utils.resource
+
+*** Keywords ***
+Send Dhclient Request
+    [Documentation]    Executes a dhclient against a particular interface on the RG (src)
+    [Arguments]    ${iface}    ${ip}    ${user}    ${pass}=${None}
+    ...    ${container_type}=${None}    ${container_name}=${None}
+    ${result}=    Login And Run Command On Remote System
+    ...    dhclient -nw ${iface}
+    ...    ${ip}    ${user}    ${pass}    ${container_type}    ${container_name}
+    [Return]    ${result}
+
+Send Dhclient Request K8S
+    [Documentation]    Run dhclient inside rg container in K8s
+    ${RG_CONTAINER}=    Wait Until Keyword Succeeds    60s    1s
+    ...    Run    kubectl -n voltha get pod|grep "^rg[0-]"|cut -d' ' -f1
+    Run    kubectl -n voltha exec ${RG_CONTAINER} -- sed -i 's/timeout 300;/timeout 30;/' /etc/dhcp/dhclient.conf
+    Run    kubectl -n voltha exec ${RG_CONTAINER} -- ifconfig eth0 0.0.0.0
+    Run    kubectl -n voltha exec ${RG_CONTAINER} -- dhclient
+
+Add Default Route to Dst Gateway
+    [Documentation]    Adds an entry to the routing table on the RG (src)
+    # FIXME - Argument order of iface/ip/user/pass should match other functions
+    [Arguments]    ${src_gateway}    ${dst_subnet}    ${iface}    ${ip}
+    ...    ${user}    ${pass}=${None}    ${container_type}=${None}    ${container_name}=${None}
+    ${result}=    Login And Run Command On Remote System
+    ...    ip route add ${dst_subnet} via ${src_gateway} dev ${iface}
+    ...    ${ip}    ${user}    ${pass}    ${container_type}    ${container_name}
+    [Return]    ${result}
+
+Check IPv4 Address on DHCP Client
+    [Documentation]    Check if the sepcified interface has an IPv4 address assigned
+    # FIXME - should ip_should_exist have a default value?
+    [Arguments]    ${ip_should_exist}    ${iface}    ${ip}    ${user}    ${pass}=${None}
+    ...    ${container_type}=${None}    ${container_name}=${None}
+    ${output}=    Login And Run Command On Remote System
+    ...    ip address show ${iface}
+    ...    ${ip}    ${user}    ${pass}    ${container_type}    ${container_name}
+    # FIXME - ipv4_regex not set if container_type != K8S?
+    ${ipv4_regex}=    Set Variable If    '${container_type}' != 'K8S'
+    ...    \\b([0-9]{1,3}\\.){3}[0-9]{1,3}\\b    \\b(172)\\.(18)(\\.([0-9]{1,3})){2}\\b
+    # FIXME - use a boolean rather than string comparison against truthy value
+    Run Keyword If    '${ip_should_exist}' == 'True'    Should Match Regexp
+    ...    ${output}    ${ipv4_regex}
+    Run Keyword If    '${ip_should_exist}' == 'False'    Should Not Match Regexp
+    ...    ${output}    ${ipv4_regex}
+
+Start DHCP Server on Remote Host
+    [Documentation]    Start the 'dhcpd' process on specified network interface
+    ...    on a remote host
+    [Arguments]    ${interface}    ${ip}    ${user}    ${pass}=${None}
+    ...    ${container_type}=${None}    ${container_name}=${None}
+    ${result}=    Login And Run Command On Remote System
+    ...    dhcpd -cf /etc/dhcp/dhcpd.conf ${interface}
+    ...    ${ip}    ${user}    ${pass}    ${container_type}    ${container_name}