1. Remove certificate file 'bindctl.pem'. 2. Add options -c(--certificate-chain) to bindctl. 3. Override class HTTPSConnection to support server certificate validation. 4. Rename module name from 'Cmd-Ctrl' to 'Cmdctl'. 5.  Add support to cmdctl.spec file, now there are three configurable items for cmdctl: 'key_file', 'cert_file' and 'accounts_file', all of them can be changed in runtime. 

git-svn-id: svn://bind10.isc.org/svn/bind10/trunk@2357 e5f2f494-b856-4b98-b285-d166d9295462