Construct lenses correctly for different 'lens' versions
Construct lenses correctly for different 'lens' versions

As the interface of the TH code for generating lenses changed twice in
4.*, we need to differentiate between versions accordingly.

Signed-off-by: Petr Pudlak <9d19625f8ee825a2c398462ed335cbcf98f79c32@google.com>
Reviewed-by: Klaus Aehlig <4ce51de36d9068cd7db2eec1151e0f3f95419008@google.com>

onponomarev/ganeti,leshchevds/ganeti,andir/ganeti,andir/ganeti,dimara/ganeti,grnet/snf-ganeti,yiannist/ganeti,ganeti/ganeti,mbakke/ganeti,yiannist/ganeti,onponomarev/ganeti,ganeti/ganeti,ganeti/ganeti,bitemyapp/ganeti,grnet/snf-ganeti,leshchevds/ganeti,andir/ganeti,dimara/ganeti,mbakke/ganeti,bitemyapp/ganeti,yiannist/ganeti,leshchevds/ganeti,mbakke/ganeti