Fixed bugs caused by DNS challenge PR

- Fixed concurrency in EAB and DNS credential save
- Fixed missing CA name in ACME Obtain certificate handler
- Optimized acmedns code config
- Fixed a lot of front-end bugs in acme snippet

tools/dns_challenge_update/code-gen/update.sh

@@ -22,5 +22,5 @@ go run ./extract.go
 echo "Cleaning up lego"
 # Comment the line below if you dont want to pull everytime update
 # This is to help go compiler to not load all the lego source file when compile
-rm -rf ./lego/
+#rm -rf ./lego/
 echo "Config generated"