Remove Flask banner (#1812)

Author: bingwang-ms

ansible/library/exabgp.py

@@ -64,6 +64,10 @@
 from flask import Flask, request
 import sys
 
+#Disable banner msg from app.run, or the output might be caught by exabgp and run as command
+cli = sys.modules['flask.cli']
+cli.show_server_banner = lambda *x: None
+
 app = Flask(__name__)
 
 # Setup a command route to listen for prefix advertisements
@@ -179,7 +183,7 @@ def setup_exabgp_conf(name, router_id, local_ip, peer_ip, local_asn, peer_asn, p
                     group_updates=group_updates)
     with open("/etc/exabgp/%s.conf" % name, 'w') as out_file:
         out_file.write(data)
- 
+
 def remove_exabgp_conf(name):
     try:
         os.remove("/etc/exabgp/%s.conf" % name)