gitignore: Add generated error and server files

Had to add .dirstamp to get the YAML build dirs to
disappear.

Change-Id: Id636f13e89701ee9f94d89fd36e4f2c31f714f51
Signed-off-by: Gunnar Mills <gmills@us.ibm.com>
diff --git a/.gitignore b/.gitignore
index 6bffc32..3e65050 100644
--- a/.gitignore
+++ b/.gitignore
@@ -9,6 +9,7 @@
 /py-compile
 /test-driver
 /ylwrap
+.dirstamp
 
 # http://www.gnu.org/software/autoconf
 
@@ -43,6 +44,10 @@
 /phosphor-version-software-manager
 /phosphor-download-manager
 /phosphor-image-updater
+server.hpp
+server.cpp
+error.hpp
+error.cpp
 Makefile
 .deps
 /test/utest