What you can import depends on what openHAB version the pom.xml files of your project are. If you have version 2.5 you can import eclipse and if it’s 3.0 it will be openHAB. So it looks like you are using the 3.0 base while you want to develop something for 2.5. It’s unclear to me how you ended up in this situation, but it looks like you checked out or installed 3.0 and than copied the 2.5 code into the project. In which case you need to git checkout the 2.5.x branch, either run the skeleton script again if you used it and than copy the code into it again.
As @5iver mentions, if you want a binding included in openHAB repository it needs to be 3.0, but if you want to run it for yourself or distribute it yourself you can just develop on 2.5.
