Attn: Default special attention changed to TI

When a special attention occurs the attention handler uses the get TI
info chipop to determine whether to service either a TI or a
breakipoint. If this chipop is not available or is not functional the
attention handler will assume a TI has occurred. With this new behavior
an additional attention handler configuration option was added
(--defaultbreakpoint) which will allow breakpoints to be handled on
systems where the get TI info chipop is not available or not functional.

Signed-off-by: Ben Tyner <ben.tyner@ibm.com>
Change-Id: I1b386b5daf06021acd6567fdad39c21903e2ac3b
diff --git a/attn/attn_config.cpp b/attn/attn_config.cpp
index e2d4a72..6ab6e19 100644
--- a/attn/attn_config.cpp
+++ b/attn/attn_config.cpp
@@ -7,6 +7,7 @@
 Config::Config()
 {
     setFlagAll();
+    iv_flags.reset(dfltBreakpoint); // default value is clear
 }
 
 /** @brief Get state of flag */