Update copied 00-netty.xml with name enforcing of 'netty-global-event-executor' to 'singleton'.

Change-Id: Ibe4882b83ace8cbad230375cbb9d3786128e134f
Signed-off-by: Tomas Olvecky <tolvecky@cisco.com>
Merge "Update copied 00-netty.xml with name enforcing of 'netty-global-event-executor' to 'singleton'."