We should update makefiles, manifests, yaml and all files that has reference to the version.

The rationale is that the version should be bumped on the devel branch at the beginning of the release development cycle .

A basic idea of how this PR would do:

```
Files=$(grep -r '1\.5\.2' * | cut -d: -f1 | sort -u)
for i in $Files ; do sed -i 's/'1\.5\.2/1.7.0/' $i;done
git add $Files
```

After that, create a PR to github.com/openshift/sandboxed-containers-operator.

*NOTE:* This issue came from a template. If you find any problems with it, please contact the admins so we can update the template accordingly for the next release.