[feature] Adds a --filter option to `cmd` for pretty-printing.

The option accepts a message type and prints the values in the csv
format:
msgtype, time, payload if the --filter option is recognized
msgtype, time otherwise
The print is force-flushed on stdout.
This switches CI to the "refactored" CI identifier at argotests/tests
8 jobs for pretty-printing-cmd-listen in 2 minutes and 21 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build
passed #16986
integration
containers.build

00:00:01

passed #16987
integration
libnrm.build

00:00:07

passed #16988
integration
nrm.build

00:00:05

 
  Test
passed #16989
rapl
py.test

00:01:08

passed #16990
integration
TestHello.test

00:00:10

passed #16991
integration
TestListen.test

00:00:10

passed #16992
integration
TestPerfwrapper.test

00:00:12

 
  Style
passed #16993
flake8

00:01:05