Cleanup the console buffer on stopping the SOL payload.

Resolves openbmc/openbmc#1811

Change-Id: I45c7f9379e4df28733f55fbe4830573d0fe09c14
Signed-off-by: Tom Joseph <tomjoseph@in.ibm.com>
diff --git a/sol/sol_manager.cpp b/sol/sol_manager.cpp
index 90ecffe..889065f 100644
--- a/sol/sol_manager.cpp
+++ b/sol/sol_manager.cpp
@@ -127,6 +127,8 @@
     if (payloadMap.empty())
     {
         consoleFD.reset();
+
+        dataBuffer.erase(dataBuffer.size());
     }
 }