ZOOKEEPER-4752: Remove version files in zookeeper-server/src/main from .gitignore (#2073)

(cherry picked from commit ce5b0b88834a0afaabebeb332ee486cb4dddef04)
Signed-off-by: Andor Molnar <andor@apache.org>

.gitignore

@@ -69,8 +69,6 @@ tags
 obj
 zookeeper-server/src/main/resources/lib/ant-eclipse-*
 zookeeper-server/src/main/resources/lib/ivy-*
-zookeeper-server/src/main/java/org/apache/zookeeper/version/Info.java
-zookeeper-server/src/main/java/org/apache/zookeeper/version/VersionInfoMain.java
 zookeeper-client/zookeeper-client-c/Makefile.in
 zookeeper-client/zookeeper-client-c/aclocal.m4
 zookeeper-client/zookeeper-client-c/autom4te.cache/