SW-609: Add CentOS7 support for finding boost-python3 libs

CMake/FindBoost.cmake

@@ -73,6 +73,11 @@ if("${Boost_FIND_COMPONENTS}" MATCHES "python")
         string(REPLACE "python"
                        "python-py${PYTHON_VERSION_MAJOR}${PYTHON_VERSION_MINOR}"
                Boost_FIND_COMPONENTS "${Boost_FIND_COMPONENTS}")
+        if(NOT Boost_python_FOUND)
+          string(REPLACE "python-py${PYTHON_VERSION_MAJOR}${PYTHON_VERSION_MINOR}"
+                         "python3"
+                 Boost_FIND_COMPONENTS "${Boost_FIND_COMPONENTS}")               
+        endif(NOT Boost_python_FOUND)
       endif(APPLE)
   endif(PYTHON_VERSION_MAJOR GREATER 2)
   else(PYTHON_FOUND)