open-converged-wireless: Import 21.02 based uCentral tree

Signed-off-by: John Crispin <john@phrozen.org>

docker/Dockerfile

@@ -0,0 +1,12 @@
+FROM ubuntu:20.04
+
+RUN apt-get update \
+    && DEBIAN_FRONTEND="noninteractive" apt-get -y install tzdata \
+    && apt-get install -y \
+            time git-core build-essential gcc-multilib \
+            libncurses5-dev zlib1g-dev gawk flex gettext wget unzip python \
+            python3 python3-pip python3-yaml openvswitch-common openvswitch-switch libssl-dev rsync \
+    && apt-get clean
+RUN git config --global user.email "you@example.com"
+RUN git config --global user.name "Your Name"
+RUN pip3 install kconfiglib