Switching from wheezy to jessie.

tools/jenkins/grpc_jenkins_slave/Dockerfile

@@ -30,7 +30,7 @@
 # A work-in-progress Dockerfile that allows running gRPC test suites
 # inside a docker container.
 
-FROM debian:wheezy
+FROM debian:jessie
 
 # Install Git.
 RUN apt-get update && apt-get install -y \
@@ -38,12 +38,9 @@ RUN apt-get update && apt-get install -y \
   autotools-dev \
   build-essential \
   bzip2 \
-  clang \
-  clang++ \
   curl \
   gcc \
   git \
-  libc++-dev \
   libc6 \
   libc6-dbg \
   libc6-dev \
@@ -60,7 +57,7 @@ RUN apt-get update && apt-get install -y \
 
 ##################
 # C++ dependencies
-RUN apt-get update && apt-get -y install libgflags-dev libgtest-dev
+RUN apt-get update && apt-get -y install libgflags-dev libgtest-dev libc++-dev clang
 
 #################
 # C# dependencies
@@ -68,9 +65,12 @@ RUN apt-get update && apt-get -y install libgflags-dev libgtest-dev
 # Update to a newer version of mono
 RUN apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF
 RUN echo "deb http://download.mono-project.com/repo/debian wheezy main" | tee /etc/apt/sources.list.d/mono-xamarin.list
+RUN echo "deb http://download.mono-project.com/repo/debian wheezy-apache24-compat main" | tee -a /etc/apt/sources.list.d/mono-xamarin.list
+RUN echo "deb http://download.mono-project.com/repo/debian wheezy-libjpeg62-compat main" | tee -a /etc/apt/sources.list.d/mono-xamarin.list
+RUN echo "deb http://download.mono-project.com/repo/debian wheezy-libtiff-compat main" | tee -a /etc/apt/sources.list.d/mono-xamarin.list
 
 # Install dependencies
-RUN apt-get update && apt-get install -y \
+RUN apt-get update && apt-get -y dist-upgrade && apt-get install -y \
     mono-devel \
     nunit \
     nunit-console \