Don't just hardcode the max length of the PMI name as it could be wrong. PMI2 installations seem to be retaining at least some of the PMI functions, so use the one to get the max name length.

This commit was SVN r28962.

opal/mca/db/pmi/db_pmi.c

@@ -586,15 +586,10 @@ static int setup_pmi(void)
     }
 #endif
 
-#if WANT_PMI2_SUPPORT
-    /* TODO -- is this ok */
-    max_length = 1024;
-#else
     if (PMI_SUCCESS != (rc = PMI_KVS_Get_name_length_max(&max_length))) {
         OPAL_PMI_ERROR(rc, "PMI_KVS_Get_name_length_max");
         return OPAL_ERROR;
     }
-#endif
     pmi_kvs_name = (char*)malloc(max_length);
     if (NULL == pmi_kvs_name) {
         return OPAL_ERR_OUT_OF_RESOURCE;