Change from cmake -E copy_directory to cp -r

For some reason, this just fails sometimes on my Linux RHEL6 machine with
cmake 3.11.  I am tired of dealing with this.  Moving to cp -r fixed this
problem.

Build/Test Cases Summary
Enabled Packages:
Enabled all Packages
0) MPI_DEBUG => passed: passed=361,notpassed=0 (1.39 min)
1) SERIAL_RELEASE => passed: passed=361,notpassed=0 (1.00 min)
Other local commits for this build/test group: d5840cc, 89f3dfd, 6de62c0

test/ci_support/CMakeLists.txt

@@ -207,14 +207,14 @@ FUNCTION(Test_TribitsExampleProject_w_tribits_get_tribits_packages_from_files_li
     OVERALL_NUM_MPI_PROCS 1
 
     TEST_0
-      CMND "${CMAKE_COMMAND}"
-      ARGS -E copy_directory
+      CMND cp
+      ARGS -r
         "${${PROJECT_NAME}_TRIBITS_DIR}/examples/TribitsExampleProject"
 	TribitsExampleProject
 
     TEST_1
-      CMND "${CMAKE_COMMAND}"
-      ARGS -E copy_directory
+      CMND cp
+      ARGS -r
         "${${PROJECT_NAME}_TRIBITS_DIR}"
 	TribitsExampleProject/cmake/tribits
 

test/ci_support/DumpXmlDepsTests/CMakeLists.txt

@@ -64,10 +64,8 @@ TRIBITS_ADD_ADVANCED_TEST( DepXmlDumpTests_NoProjectSourceDir
 
   TEST_0
     MESSAGE "Copy tribits dir so that it will not appear in the standard location under any TriBITS project"
-    CMND ${CMAKE_COMMAND}
-    ARGS -E copy_directory
-      ${${PROJECT_NAME}_TRIBITS_DIR}
-      tribits
+    CMND cp
+    ARGS -r ${${PROJECT_NAME}_TRIBITS_DIR} tribits
 
   TEST_1 CMND "${CMAKE_COMMAND}"
     ARGS
@@ -137,16 +135,12 @@ TRIBITS_ADD_ADVANCED_TEST( DepXmlDumpTests_DefaultProjectSourceDir
   OVERALL_NUM_MPI_PROCS 1
 
   TEST_0
-    CMND ${CMAKE_COMMAND}
-    ARGS -E copy_directory
-      ${MOCK_TRILINOS_DIR}
-      MockTrilinos
+    CMND cp
+    ARGS -r ${MOCK_TRILINOS_DIR} MockTrilinos
 
   TEST_1
-    CMND ${CMAKE_COMMAND}
-    ARGS -E copy_directory
-      ${${PROJECT_NAME}_TRIBITS_DIR}
-      MockTrilinos/cmake/tribits
+    CMND cp
+    ARGS -r ${${PROJECT_NAME}_TRIBITS_DIR} MockTrilinos/cmake/tribits
 
   TEST_2 CMND "${CMAKE_COMMAND}"
     ARGS