cpukit, testsuite: Add rtems_printf and rtems_printer support.

This change adds rtems_printf and related functions and wraps the
RTEMS print plugin support into a user API. All references to the
plugin are removed and replaced with the rtems_printer interface.

Printk and related functions are made to return a valid number of
characters formatted and output.

The function attribute to check printf functions has been added
to rtems_printf and printk. No changes to remove warrnings are part
of this patch set.

The testsuite has been moved over to the rtems_printer. The testsuite
has a mix of rtems_printer access and direct print control via the
tmacros.h header file. The support for begink/endk has been removed
as it served no purpose and only confused the code base. The testsuite
has not been refactored to use rtems_printf. This is future work.

testsuites/support/include/buffer_test_io.h

@@ -24,7 +24,7 @@ extern "C" {
  */
 #if defined(TESTS_USE_PRINTK)
 
-#include <rtems/bspIo.h>
+#include <rtems/print.h>
 
   #undef printf
   #define printf(...) \
@@ -54,9 +54,9 @@ extern "C" {
     do { \
     } while (0)
 
-  #define TEST_BEGIN() rtems_test_begink()
+  #define TEST_BEGIN() printk(TEST_BEGIN_STRING)
 
-  #define TEST_END() rtems_test_endk()
+  #define TEST_END() printk(TEST_END_STRING)
 
 /*
  *  BUFFER TEST OUTPUT
@@ -156,9 +156,9 @@ extern "C" {
       fflush(stdout); \
     } while (0)
 
-  #define TEST_BEGIN() rtems_test_begin()
+  #define TEST_BEGIN() printf(TEST_BEGIN_STRING)
 
-  #define TEST_END() rtems_test_end()
+  #define TEST_END() printf(TEST_END_STRING)
 
 /*
  *  USE IPRINT
@@ -205,11 +205,9 @@ extern "C" {
       fflush(stdout); \
     } while (0)
 
-  #define TEST_BEGIN() \
-    rtems_test_begin_with_plugin((rtems_printk_plugin_t) fiprintf, stderr)
+  #define TEST_BEGIN() fiprintf( stderr, TEST_BEGIN_STRING)
 
-  #define TEST_END() \
-    rtems_test_end_with_plugin((rtems_printk_plugin_t) fiprintf, stderr)
+  #define TEST_END()  fiprintf( stderr, TEST_END_STRING)
 
 #endif