… ros2 development.

* To enable the same, enable setting log levels from rmw_fastrtps layers,
* Add generic logging level parameters to 'rmw.h' which would be used by other
  layers above like rcl/rclcpp.
* Hide DDS specific implementation inside rmw_fastrtps.

Signed-off-by: Sriram Raghunathan <sriram.max@gmail.com>

ros2/rmw#124

* The API defined is used to set the logging level particular to the DDS
implementation.
* This change is specific to DDS type Fast-RTPS.
* The file is named as rmw_configure since we could write API's of type
  'system level config setting' types here.

Signed-off-by: Sriram Raghunathan <rsriram7@visteon.com>

… the patterns being used already.

like rmw_node, rmw_publisher..

Signed-off-by: Sriram Raghunathan <sriram.max@gmail.com>

- Renmae API to suite ros styles

Signed-off-by: Sriram Raghunathan <sriram.max@gmail.com>

Signed-off-by: Sriram Raghunathan <sriram.max@gmail.com>

Signed-off-by: Sriram Raghunathan <sriram.max@gmail.com>

…iram_beta3

…g logging

Signed-off-by: Sriram Raghunathan <rsriram7@visteon.com>

Signed-off-by: Sriram Raghunathan <rsriram7@visteon.com>

…severity in error message