Add RHEL rules from the EPEL repositories

[cottsay]

These keys are used across ROS 2 Eloquent.

rosdep key	system package name	src link	pkgs link
bullet	bullet-devel	src
coinor-libipopt-dev	coin-or-CoinUtils-devel	src
ftdi-eeprom	libftdi-devel	src
ftdi-eeprom	libftdi-c++-devel	src
graphicsmagick	GraphicsMagick-c++-devel	src	pkgs
lcov	lcov	src
libceres-dev	ceres-solver-devel	src	pkgs
libftdi-dev	libftdi-devel	src
libgeos++-dev	geos-devel	src
libgflags-dev	gflags-devel	src
libgoogle-glog-dev	glog-devel	src
libgps	gpsd-devel	src	pkgs
libzmq3-dev	zeromq-devel	src	pkgs
log4cplus	log4cplus-devel	src
proj	proj-devel	src
sdl-image	SDL_image-devel	src
python-catkin-pkg	python2-catkin_pkg	src	pkgs
python-psutil	python2-psutil	src	pkgs
python-pyproj	pyproj	src	pkgs
python3-bson	python%{python3_pkgversion}-bson	src	pkgs
python3-docker	python%{python3_pkgversion}-docker	src
python3-future	python%{python3_pkgversion}-future	src	pkgs
python3-packaging	python%{python3_pkgversion}-packaging	src	pkgs
python3-tornado	python%{python3_pkgversion}-tornado	src	pkgs
python3-websocket	python%{python3_pkgversion}-websocket-client	src	pkgs

$ yum list -q --showduplicates available GraphicsMagick-c++-devel \
> SDL_image-devel bullet-devel ceres-solver-devel coin-or-CoinUtils-devel \
> geos-devel gflags-devel glog-devel gpsd-devel lcov libftdi-c++-devel \
> libftdi-devel log4cplus-devel proj-devel pyproj python2-catkin_pkg \
> python2-psutil python36-bson python36-docker python36-future \
> python36-packaging python36-tornado python36-websocket-client zeromq-devel
Available Packages
GraphicsMagick-c++-devel.x86_64        1.3.34-1.el7                        epel
SDL_image-devel.x86_64                 1.2.12-11.el7                       epel
bullet-devel.x86_64                    2.82-2.el7                          epel
ceres-solver-devel.x86_64              1.12.0-2.el7                        epel
coin-or-CoinUtils-devel.x86_64         2.10.13-1.el7                       epel
geos-devel.x86_64                      3.4.2-2.el7                         epel
gflags-devel.x86_64                    2.1.1-6.el7                         epel
glog-devel.x86_64                      0.3.3-8.el7                         epel
gpsd-devel.x86_64                      3.10-5.20140524gitd6b65b.el7        epel
lcov.noarch                            1.13-1.el7                          epel
libftdi-c++-devel.x86_64               1.1-4.el7                           epel
libftdi-devel.x86_64                   1.1-4.el7                           epel
log4cplus-devel.x86_64                 1.1.3-0.4.rc3.el7                   epel
proj-devel.x86_64                      4.8.0-4.el7                         epel
pyproj.x86_64                          1.9.2-6.20120712svn300.el7          epel
python2-catkin_pkg.noarch              0.4.14-1.el7                        epel
python2-psutil.x86_64                  5.6.7-1.el7                         epel
python36-bson.x86_64                   2.5.2-5.el7                         epel
python36-docker.noarch                 2.6.1-3.el7                         epel
python36-future.noarch                 0.18.2-2.el7                        epel
python36-packaging.noarch              16.8-6.el7                          epel
python36-tornado.x86_64                4.4.2-2.el7                         epel
python36-websocket-client.noarch       0.47.0-2.el7                        epel
zeromq-devel.x86_64                    4.1.4-6.el7                         epel