Add Travis CI debug instructions

Signed-off-by: Jeroen Koekkoek <jeroen@koekkoek.nl>

docs/dev/debugging.md

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+# Troubleshooting Travis CI builds locally in a Docker image
+
+This document describes how to run a Travis CI build locally using docker.
+
+Most of the information is available in the Getting Started guide under
+[Common Build Problems](https://docs.travis-ci.com/user/common-build-problems/#running-a-container-based-docker-image-locally),
+but this guide is specifically tailored towards building Cyclone.
+
+> Ensure [Docker](https://www.docker.com/) is installed, the daemon is running
+> and you have the required privileges.
+
+> See this [entry](https://developer.fedoraproject.org/tools/docker/about.html)
+> on the Fedora Developer Portal for setting up and using Docker on Fedora.
+
+> The *instance:* line under *Worker information* in the *Job log* will show
+> exactly which instance of the *ci-garnet* image is used, but the latest image
+> will do just fine.
+
+```
+Worker information
+...
+instance: travis-job-70cf1506-780a-445e-8f0d-da928d16ed65 travis-ci-garnet-trusty-1512502259-986baf0 (via amqp)
+...
+```
+
+1. Start a Docker container detached with `/sbin/init`.
+
+ ```
+$ docker run --name travis-debug --cap-add=SYS_PTRACE --security-opt seccomp=unconfined -dit travisci/ci-garnet:packer-1515445631-7dfb2e1 /sbin/init
+```
+
+ > The image is quite large (4 GB) and it will take some time to download.
+
+2. Open a login shell in the running container.
+
+ ```
+$ docker exec -it travis-debug bash -l
+```
+
+3. Install all packages required to build Cyclone.
+
+ ```
+$ add-apt-repository ppa:ubuntu-toolchain-r/test
+$ echo "deb http://apt.llvm.org/trusty/ llvm-toolchain-trusty-6.0 main" >> /etc/apt/sources.list.d/llvm-toolchain-6.0.list
+$ wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | apt-key add -
+$ apt-get update
+$ apt-get install gcc-8 g++-8 clang-6.0 oracle-java8-set-default maven
+```
+
+4. Switch to the *travis* user.
+
+ ```
+su - travis
+```
+
+5. Install The [Conan C/C++ Package Manager](https://conan.io).
+
+ ```
+$ pip intall conan --upgrade --user
+$ conan user
+```
+
+6. Add the required repositories.
+
+ ```
+$ conan remote add atolab https://api.bintray.com/conan/atolab/public-conan
+$ conan remote add bincrafters https://api.bintray.com/conan/bincrafters/public-conan
+```
+
+7. Clone the git repository.
+
+ ```
+$ git clone https://github.com/eclipse-cyclonedds/cyclonedds.git
+```
+
+8. Build the project and run the tests.
+
+ > By default CMake and Conan will choose *gcc*. To switch to *clang*, set the
+ > CC and CXX environment variables to clang and clang++ respectively.
+
+ ```
+$ export CC=gcc-8
+$ export CXX=g++-8
+$ cd cyclonedds
+$ mkdir build
+$ conan install ..
+$ cmake -DBUILD_TESTING=on ../src
+$ cmake --build .
+$ ctest -T test
+```