ganeti.http: Implement handshake socket operation
ganeti.http: Implement handshake socket operation

Reviewed-by: iustinp


yiannist/ganeti,apyrgio/snf-ganeti,ganeti-github-testing/ganeti-test-1,ganeti/ganeti,grnet/snf-ganeti,andir/ganeti,ganeti/ganeti,bitemyapp/ganeti,leshchevds/ganeti,mbakke/ganeti,apyrgio/snf-ganeti,ganeti/ganeti,yiannist/ganeti,bitemyapp/ganeti,onponomarev/ganeti,ganeti-github-testing/ganeti-test-1,mbakke/ganeti,dimara/ganeti,mbakke/ganeti,andir/ganeti,yiannist/ganeti,dimara/ganeti,onponomarev/ganeti,leshchevds/ganeti,leshchevds/ganeti,apyrgio/ganeti,apyrgio/ganeti,andir/ganeti,grnet/snf-ganeti