set managed dns to true (#3362)

Author: abhishek9686

scripts/netmaker.default.env

@@ -93,7 +93,7 @@ EMAIL_SENDER_PASSWORD=
 # default domain for internal DNS lookup
 DEFAULT_DOMAIN=hosted.nm
 # managed dns setting, set to true to resolve dns entries on netmaker network
-MANAGE_DNS=false
+MANAGE_DNS=true
 # set to true, old acl is supported, otherwise, old acl is disabled
 OLD_ACL_SUPPORT=true
 # if STUN is set to true, hole punch is called