dpif-dpdk: Add debug messages for port removal

It's quite difficult to debug dpif-datapath interaction from vswitchd
output when we don't show details of all transactions. We need to fix
this.

- Add a debug message for when a port is removed successfully.
- Add an error message for when a port cannot be removed from the vport
  table
- Remove some unnecessary code

Change-Id: I2f13220d2d80c11cdf03d56c1b40fbc7fa746a62
Signed-off-by: Stephen Finucane <stephen.finucane@intel.com>
Reviewed-by: Kevin Traynor <kevin.traynor@intel.com>
Reviewed-by: Meghan Halton <meghan.halton@intel.com>
datapath: Enhanced port mod logging messages

- Ensure all values are single quoted
- Be verbose where possible
- Ensure UINT32 is displayed as such

Change-Id: I610b4cc8bc3f10de2c854872a12450d621e6c083
Signed-off-by: Stephen Finucane <stephen.finucane@intel.com>
Reviewed-by: Mark D. Gray <mark.d.gray@intel.com>
Reviewed-by: Meghan Halton <meghan.halton@intel.com>
datapath: Make upcall failures more verbose

Change-Id: I6de12ff0467b95fb19ae670aa3b1398ad898592e
Signed-off-by: Stephen Finucane <stephen.finucane@intel.com>
Reviewed-by: Kevin Traynor <kevin.traynor@intel.com>
Reviewed-by: Meghan Halton <meghan.halton@intel.com>