Add test binary for measuring device throughput on Ubuntu.

[130s]

Adding test-com_throughput.c that is based on Modifying test-com.cto measure the throughput of 1) device access and 2) communication between driver and a client program to the driver.
Also add an installation rule for it.

[130s]

Build is failing on ROS buildfarm (e.g.):

15:08:55 [ 80%] Building C object CMakeFiles/dynpick_com_tester.dir/src/test-com.c.o
15:08:55 /usr/lib/ccache/x86_64-linux-gnu-gcc  -DROSCONSOLE_BACKEND_LOG4CXX -DROS_PACKAGE_NAME=\"dynpick_driver\" -I/opt/ros/kinetic/include  -g -O2 -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2    -o CMakeFiles/dynpick_com_tester.dir/src/test-com.c.o   -c /tmp/binarydeb/ros-kinetic-dynpick-driver-0.0.10/src/test-com.c
15:08:55 /tmp/binarydeb/ros-kinetic-dynpick-driver-0.0.10/src/test-com.c: In function ‘main’:
15:08:55 /tmp/binarydeb/ros-kinetic-dynpick-driver-0.0.10/src/test-com.c:126:2: warning: implicit declaration of function ‘SetComAttr’ [-Wimplicit-function-declaration]
15:08:55   SetComAttr(fd);
15:08:55   ^
15:08:55 /tmp/binarydeb/ros-kinetic-dynpick-driver-0.0.10/src/test-com.c:201:18: error: format not a string literal and no format arguments [-Werror=format-security]
15:08:55    fprintf(stderr, str);
15:08:55                   ^
15:08:55 /tmp/binarydeb/ros-kinetic-dynpick-driver-0.0.10/src/test-com.c:210:11: error: format not a string literal and no format arguments [-Werror=format-security]
15:08:55     printf(str);
15:08:55            ^
15:08:55 /tmp/binarydeb/ros-kinetic-dynpick-driver-0.0.10/src/test-com.c:226:2: warning: implicit declaration of function ‘exit’ [-Wimplicit-function-declaration]
15:08:55   exit(0);   //scanf("%s", str);
15:08:55   ^
15:08:55 /tmp/binarydeb/ros-kinetic-dynpick-driver-0.0.10/src/test-com.c:226:2: warning: incompatible implicit declaration of built-in function ‘exit’
15:08:55 /tmp/binarydeb/ros-kinetic-dynpick-driver-0.0.10/src/test-com.c:226:2: note: include ‘<stdlib.h>’ or provide a declaration of ‘exit’
15:08:55 /tmp/binarydeb/ros-kinetic-dynpick-driver-0.0.10/src/test-com.c:93:2: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result]
15:08:55   scanf("%d", &comNo);
15:08:55   ^
15:08:55 cc1: some warnings being treated as errors
15:08:55 make[4]: *** [CMakeFiles/dynpick_com_tester.dir/src/test-com.c.o] Error 1
15:08:55 CMakeFiles/dynpick_com_tester.dir/build.make:65: recipe for target 'CMakeFiles/dynpick_com_tester.dir/src/test-com.c.o' failed
15:08:55 make[3]: *** [CMakeFiles/dynpick_com_tester.dir/all] Error 2