Add Dockerfiles to aid in testing

Signed-off-by: Zack Cerza <zack@redhat.com>

devtools/containers/README.md

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+Dockerfiles for development
+===========================
+
+To facilitate in development - specifically, running tests, two Dockerfiles are
+provided:
+
+* [`./centos/Dockerfile`](./centos/Dockerfile) CentOS 6, for testing with python2.6
+* [`./fedora/Dockerfile`](./fedora/Dockerfile) Fedora 32, for testing with python3.8
+
+To use them, taking fedora as an example:
+
+    docker build -t koji_test_fedora:latest --no-cache ./devtools/containers/fedora
+    docker run --rm -v $PWD:/koji --name koji_test koji_test_fedora:latest bash -c "cd /koji && tox -e flake8,py3"

devtools/containers/centos/Dockerfile

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+FROM centos:6
+RUN \
+  yum install -y \
+    gcc \
+    git \
+    make \
+    krb5-devel \
+    libffi-devel \
+    openssl-devel \
+    pyOpenSSL \
+    python-devel \
+    redhat-rpm-config \
+    rpm-build \
+    rpm-python \
+    yum-utils && \
+  yum install -y epel-release && \
+  yum install -y \
+    python-flake8 \
+    python-pip \
+    python-psycopg2 \
+    python-qpid-proton \
+    python-requests-kerberos && \
+  pip install -U 'pip==9.0.1' && \
+  pip install -U tox

devtools/containers/fedora/Dockerfile

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+FROM fedora:32
+RUN \
+  dnf install -y \
+  gcc \
+  git \
+  glib2-devel \
+  glibc-langpack-en \
+  krb5-devel \
+  libffi-devel \
+  libxml2-devel \
+  make \
+  openssl-devel \
+  python3-devel \
+  python3-pip \
+  python3-rpm \
+  python3-tox \
+  redhat-rpm-config \
+  rpm-build \
+  sqlite-devel \
+  yum-utils