zypper: consider -%{RELEASE} as part of the version

##### Issue Type:
Bugfix Pull Request
##### Ansible Version: 
1.6.6
##### Environment: 
SLES 11.3
##### Summary:
packaging/zypper does not recognize "changed = True" when package has the same version, but a different (higher) release number (relevant for state=latest)
##### Steps To Reproduce:
get a package, where the version number on upgrade stays the same, but release number is higher. then run:
```bash
ansible -m zypper -a 'name=your-package state=latest'
```
##### Expected Results:
package gets upgraded to latest and "Changed" is triggerd
##### Actual Results:
package gets upgraded to latest but no "Changed" is triggerd