tcpconnect: supported UID options

[takumakume]

Hi.

UID related options supported.

Specification similar to this patch that I wrote: #2113

• The -U option prints a UID column:

  # ./tcpconnect -U
  UID   PID    COMM         IP SADDR            DADDR            DPORT
  0     31333  telnet       6  ::1              ::1              23
  0     31333  telnet       4  127.0.0.1        127.0.0.1        23
  1000  31322  curl         4  127.0.0.1        127.0.0.1        80
  1000  31322  curl         6  ::1              ::1              80

• The -u option filtering UID:

  # ./tcpconnect -Uu 1000
  UID   PID    COMM         IP SADDR            DADDR            DPORT
  1000  31338  telnet       6  ::1              ::1              23
  1000  31338  telnet       4  127.0.0.1        127.0.0.1        23

[yonghong-song]

[buildbot, test this please]

[yonghong-song]

The github complains there is a conflict on tools/tcpconnect.py against trunk. Could you take a look and resolve the conflicts. See the above. Maybe you can use github resolve conflicts in the above?

[yonghong-song]

[buildbot, test this please]

[yonghong-song]

[buildbot, test this please]

[takumakume]

Thank you for merge!