Update docker util script and travis to use new base container

Dockerfile

@@ -1,22 +1,4 @@
-FROM debian:9
-
-RUN apt-get update && apt-get install --no-install-recommends -y \
-    avr-libc \
-    avrdude \
-    binutils-arm-none-eabi \
-    binutils-avr \
-    build-essential \
-    dfu-programmer \
-    dfu-util \
-    gcc \
-    gcc-avr \
-    git \
-    libnewlib-arm-none-eabi \
-    software-properties-common \
-    unzip \
-    wget \
-    zip \
-    && rm -rf /var/lib/apt/lists/*
+FROM qmkfm/base_container
 
 # upgrade gcc-arm-none-eabi from the default 5.4.1 to 6.3.1 due to ARM runtime issues
 RUN wget -q https://developer.arm.com/-/media/Files/downloads/gnu-rm/6-2017q2/gcc-arm-none-eabi-6-2017-q2-update-linux.tar.bz2 -O - | \