Adding docker files, modifying scripts and code to handle ubuntu 16.04

scripts/docker/ubuntu.16.04/Dockerfile

@@ -0,0 +1,63 @@
+#
+# Copyright (c) .NET Foundation and contributors. All rights reserved.
+# Licensed under the MIT license. See LICENSE file in the project root for full license information.
+#
+
+FROM ubuntu:16.04
+
+# Install the base toolchain we need to build anything (clang, cmake, make and the like)
+# this does not include libraries that we need to compile different projects, we'd like
+# them in a different layer.
+RUN apt-get update && \
+    apt-get install -y wget && \
+    echo "deb http://llvm.org/apt/trusty/ llvm-toolchain-trusty-3.6 main" | tee /etc/apt/sources.list.d/llvm.list && \
+    wget -O - http://llvm.org/apt/llvm-snapshot.gpg.key | apt-key add - && \
+    apt-get update && \
+    apt-get install -y cmake \
+            make \
+            llvm-3.5 \
+            clang-3.5 \
+            lldb-3.6 \
+            lldb-3.6-dev && \
+    apt-get clean
+
+# Install tools used by the VSO build automation.  nodejs-legacy is a Debian specific
+# package that provides `node' on the path (which azure cli needs).
+RUN apt-get install -y git \
+            zip \
+            curl \
+            tar \
+            nodejs \
+            nodejs-legacy \
+            npm && \
+    apt-get clean && \
+    npm install -g azure-cli && \
+    npm cache clean
+
+# Dependencies for CoreCLR and CoreFX
+RUN apt-get install -y gettext \
+            libunwind8-dev \
+            libkrb5-dev \
+            libunwind8 \
+            libicu-dev \
+            liblttng-ust-dev \
+            libcurl4-openssl-dev \
+            libssl-dev \
+            uuid-dev && \
+    apt-get clean
+
+# Setup User to match Host User, and give superuser permissions
+ARG USER_ID=0
+RUN useradd -m code_executor -u ${USER_ID} -g sudo
+RUN echo 'code_executor ALL=(ALL) NOPASSWD:ALL' >> /etc/sudoers
+
+# With the User Change, we need to change permissions on these directories
+RUN chmod -R a+rwx /usr/local
+RUN chmod -R a+rwx /home
+RUN chmod -R 755 /usr/lib/sudo
+
+# Set user to the one we just created
+USER ${USER_ID}
+
+# Set working directory
+WORKDIR /opt/code