Add support for mutiple COS object setups

[ashleyse2016]

If you have multiple COS (Class of Service) objects setup, then reporting spam or accessing the interface, results in a proxy error:

HTTP ERROR 403 Problem accessing /service/proxy. Reason Forbidden)

You can verify this by looking in the access logs:

/opt/zimbra/log/nginx.access.log

63182:1.2.3.4:59520 - [email protected] [07/Mar/2017:10:14:16 -0300] "POST /service/proxy?target=https://api.hostname.tld/api/authticket/create/username/[email protected] HTTP/1.1" 403 462 "http://webmail.host.tld/" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:50.0) Gecko/20100101 Firefox/50.0" "127.0.0.1:8080"

A way to fix this after install is to do something like (for both spamrl and api hostname):

 for i in `zmprov gac`; do zmprov mc $i +zimbraProxyAllowedDomains *.spamrl.com; done
 for i in `zmprov gac`; do zmprov mc $i +zimbraProxyAllowedDomains *.api.hostname.tld; done

This should be incorporated into the addon to check/adjust

​https://wiki.zimbra.com/wiki/Zimlet_Developers_Guide:Proxy_Servlet_Setup