python: Added upm directory for python modules

* Grouped UPM python modules into upm directory, for example:
      /usr/local/lib/python2.7/dist-packages/upm
    * Updated UPM example import statements
    * Removed unused RPATH statements from UPM src CMakeLists.txt,
      currently build collateral contains an explicit RPATH which
      is stripped from the install collateral.
    * Converted python examples to work on both python2 AND python3
    * Added ctest for loading examples w/python3
    * Removed returns from swig macros
    * UPM python module use will change...
        Before:
            import pyupm_dfrph
        After:
            from upm import pyupm_dfrph
            or
            import upm.pyupm_dfrph
            etc...
    * This commit fixes #468

Signed-off-by: Noel Eck <noel.eck@intel.com>

examples/python/lsm303.py

@@ -23,8 +23,9 @@
 # OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE
 
+from __future__ import print_function
 import time, sys, signal, atexit
-import pyupm_lsm303 as lsm303
+from upm import pyupm_lsm303 as lsm303
 
 def main():
     # Instantiate LSM303 compass on I2C
@@ -38,7 +39,7 @@ def main():
     # This lets you run code on exit,
     # including functions from myAccelrCompass
     def exitHandler():
-        print "Exiting"
+        print("Exiting")
         sys.exit(0)
 
     # Register exit handlers
@@ -57,15 +58,15 @@ def main():
         outputStr = "coor: rX {0} - rY {1} - rZ {2}".format(
         coords.__getitem__(0), coords.__getitem__(1),
         coords.__getitem__(2))
-        print outputStr
+        print(outputStr)
 
         outputStr = "coor: gX {0} - gY {1} - gZ {2}".format(
         myAccelrCompass.getCoorX(), myAccelrCompass.getCoorY(),
         myAccelrCompass.getCoorZ())
-        print outputStr
+        print(outputStr)
 
         # Get and print out the heading
-        print "heading:", myAccelrCompass.getHeading()
+        print("heading:", myAccelrCompass.getHeading())
 
         # Get the acceleration
         myAccelrCompass.getAcceleration();
@@ -75,14 +76,14 @@ def main():
         # using two different methods
         outputStr = "acc: rX {0} - rY {1} - Z {2}".format(
         accel.__getitem__(0), accel.__getitem__(1), accel.__getitem__(2))
-        print outputStr
+        print(outputStr)
 
         outputStr = "acc: gX {0} - gY {1} - gZ {2}".format(
         myAccelrCompass.getAccelX(), myAccelrCompass.getAccelY(),
         myAccelrCompass.getAccelZ())
-        print outputStr
+        print(outputStr)
 
-        print " "
+        print(" ")
         time.sleep(1)
 
 if __name__ == '__main__':