removed roslib.loadmanifest from 2 python files

Removed roslib.load_manifest (should be unnecessary for catkin anyway) to prevent:
>> process[l_arm_pos_controller-8]: started with pid [18865]
>> [l_arm_state_separator-7] process has died [pid 18851, exit code 1, cmd
>> /home/ichumuh/uni/hydro_ws/src/iai_control_pkgs/iai_control_utils/scripts/separate_joint_states.py
>> ~in_joint_states:=/joint_states
>> ~out_joint_states:=/l_arm_pos_controller/joint_states
>> __name:=l_arm_state_separator
>> __log:=/home/ichumuh/.ros/log/e45bd044-7306-11e4-8a05-f0def1aaa816/l_arm_state_separator-7.log].
>>
>> log file:
>> /home/ichumuh/.ros/log/e45bd044-7306-11e4-8a05-f0def1aaa816/l_arm_state_separator-7*.log
>>
>> process[head_state_separator-9]: started with pid [18943]
>> Traceback (most recent call last):
>>   File
>> "/home/ichumuh/uni/hydro_ws/src/iai_control_pkgs/iai_control_utils/scripts/separate_joint_states.py",
>> line 23, in <module>
>>     import roslib; roslib.load_manifest('realtime_bridge')
>>   File "/opt/ros/hydro/lib/python2.7/dist-packages/roslib/launcher.py",
>> line 62, in load_manifest
>>     sys.path = _generate_python_path(package_name, _rospack) + sys.path
>>   File "/opt/ros/hydro/lib/python2.7/dist-packages/roslib/launcher.py",
>> line 93, in _generate_python_path
>>     m = rospack.get_manifest(pkg)
>>   File "/usr/lib/python2.7/dist-packages/rospkg/rospack.py", line 159,
>> in get_manifest
>>     return self._load_manifest(name)
>>   File "/usr/lib/python2.7/dist-packages/rospkg/rospack.py", line 198,
>> in _load_manifest
>>     retval = self._manifests[name] =
>> parse_manifest_file(self.get_path(name), self._manifest_name, rospack=self)
>>   File "/usr/lib/python2.7/dist-packages/rospkg/rospack.py", line 190,
>> in get_path
>>     raise ResourceNotFound(name, ros_paths=self._ros_paths)
>> rospkg.common.ResourceNotFound: realtime_bridge
>> ROS path [0]=/opt/ros/hydro/share/ros
>> ROS path [1]=/home/ichumuh/uni/hydro_ws/src
>> ROS path [2]=/home/ichumuh/uni/euroc_ws/src
>> ROS path [3]=/opt/euroc_c2s1/ros/install/share
>> ROS path [4]=/opt/euroc_c2s1/ros/install/stacks
>> ROS path [5]=/opt/ros/hydro/share
>> ROS path [6]=/opt/ros/hydro/stacks