Dockerized development environment

This commit introduces a fully dockerized dev env you can start on any
machine that has docker without installing any direct OAI dependencies
on host.

This allows to migrate development environments between machines easily. Several
complementary scripts were added to enable smooth transition between your docker
environment and host environment. Your user and sudo should work inside the
environment.

tools/docker-dev-env/docker-compose.yml

@@ -0,0 +1,21 @@
+services:
+  openair-dev-env:
+    container_name: "openair-dev-${USER}"
+    image: openair-dev:${USER}
+    command: "sleep infinity"
+    privileged: false
+    cap_add:
+      - NET_ADMIN
+      - SYS_ADMIN
+      - NET_RAW
+      - SYS_NICE
+       # CAPS for sudo to work
+      - CAP_SETUID
+      - CAP_SETGID
+      - CAP_SETFCAP
+      - CAP_AUDIT_WRITE
+      - CAP_MKNOD
+    volumes:
+      - /home/${USER}:/home/${USER}
+    working_dir: /home/${USER}
+    hostname: oai-dev-env