Add dependency on pr2-common (pr2_mechanism_model) for euscollada conversion test

Add dependency on pr2-common (pr2_mechanism_model) for euscollada conversion test.

After this commit, jsk_model_tools travis should be fail until Euslisp deb release.
This means jsk_model_tools's travis successfully trap Euslisp version violation.

Related PR or issues:
- Waiting for Euslisp deb release
https://github.com/jsk-ros-pkg/jsk_pr2eus/pull/35
- Moving code issue
https://github.com/jsk-ros-pkg/jsk_model_tools/issues/41