cob_substitute: 0.5.1-2 in 'hydro/distribution.yaml' [bloom]

Increasing version of package(s) in repository `cob_substitute` to `0.5.1-2`:

- distro file: `hydro/distribution.yaml`
- bloom version: `0.5.2`
- previous version for package: `0.5.1-1`

## cob_lbr

```
* remove pr2_controller_msgs
* Initial catkin version. Have to find away to fix the rosjava_jni dependency.
* added service_interface.py
* cob_substitute stack for internal packages. mostly used for testing
* Contributors: abubeck, ipa-fmw, ipa-fxm
```

## cob_substitute

```
* Initial catkin version. Have to find away to fix the rosjava_jni dependency.
* Contributors: abubeck
```

## frida_description

```
* update xacro file format
* update cob_substitute
* update cob_substitute
* update xmlns + beautifying
* Merged from groovy_dev and converted additional packages to catkin
* added virtual urdfs for raw3-3 manipulators that we can not share openly
* Contributors: abubeck, ipa-fxm
```

## frida_driver

```
* removed obsolete install tags
* added dummy launch files and removed dummy python driver
* fix type  in CMakeLists
* update cob_substitute
* update cob_substitute
* Contributors: ipa-fxm, ipa-raw3-3
```

## prace_gripper_description

```
* update xmlns + beautifying
* Merged from groovy_dev and converted additional packages to catkin
* added virtual urdfs for raw3-3 manipulators that we can not share openly
* Contributors: abubeck, ipa-fxm
```

## prace_gripper_driver

```
* removed obsolete install tags
* added dummy launch files and removed dummy python driver
* fix type  in CMakeLists
* update cob_substitute
* update cob_substitute
* Contributors: ipa-fxm, ipa-raw3-3
```