added tag value for "dynamically" selected tag numbers

This commit was SVN r2576.

src/mca/oob/base/base.h

@@ -54,6 +54,7 @@ extern ompi_process_name_t mca_oob_name_self;
 #define MCA_OOB_TAG_DAEMON      6
 #define MCA_OOB_TAG_STDIO       7
 #define MCA_OOB_TAG_SCHED       8
+#define MCA_OOB_TAG_USER        1000 /* user defined tags should be assigned above this level */
 
 /*
  * OOB API