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ROS Master does not appear to be running.

You might have another issue with your ROS_MASTER_URI, if all was propperly set up you shouldn't get this message.

About your issue with openni2 it comes from the fact that roswtf automatically load plugins as soon as a package has this in its package.xml :

<roswtf plugin="PLUGIN_NAME" />

Grepping "roswtf plugin" in /opt/ros/DISTRO/share gives you two results which corresponds to the first two lines of roswtf ouput :

tf/package.xml:    <roswtf plugin="tf.tfwtf" />
openni2_launch/package.xml:    <roswtf plugin="openni2_launch.wtf_plugin" />

And now you can locate the file wtf_plugin in your system and find the script in /opt/ros/kinetic/lib/python2.7/dist-packages/openni2_launch/. Looking into the script there is this line 81 :

num_sensors_expected = rospy.get_param("openni2_num_sensors_expected", 1)

so the default value is set to 1, since you are just running roscore the param isn't set which directly lead to the error message.

You can uninstall the package openni2_launch to get rid of this if you don't use it. Or you can set the param to 0 with rosparam set openni2_num_sensors_expected 0 after running roscore or by adding <param name="openni2_num_sensors_expected" value="0"/> in your launch file.

Or you can also run roswtf --no-plugins but then it would mean that you don't use the tf plugin which can be useful.