Add progressbar support to most download actions

[sergiusens]

LP: #1597387

Signed-off-by: Sergio Schvezov sergio.schvezov@ubuntu.com

[sergiusens]

I am only hesitant about the module name snapcraft.internal.network luckily it is internal but it makes me think this should be snapcraft.internal.indicators to later on move indicator ui stuff here.

[kyrofa]

I'm still grumpy about this.

[kyrofa]

Big 👍 here, nice work. I agree on the module name though-- indicators is better.

[josepht]

LGTM

[sergiusens]

Just ftr, all good with this branch still 😉

======================================================================
ERROR: demos_tests.test_shout.ShoutTestCase.test_shout
----------------------------------------------------------------------
output: {{{b''}}}

Traceback (most recent call last):
  File "/tmp/adt-run.XawG72/build.6SZ/real-tree/snaps_tests/demos_tests/test_shout.py", line 25, in test_shout
    self.build_snap(self.snap_content_dir)
  File "/tmp/adt-run.XawG72/build.6SZ/real-tree/snaps_tests/__init__.py", line 159, in build_snap
    self._clean(working_dir)
  File "/tmp/adt-run.XawG72/build.6SZ/real-tree/snaps_tests/__init__.py", line 164, in _clean
    self._run_command(command, project_dir)
  File "/tmp/adt-run.XawG72/build.6SZ/real-tree/snaps_tests/__init__.py", line 187, in _run_command
    'Expected output {!r} not found.'.format(expect)) from None
snaps_tests.CommandError: Error running command 'snapcraft clean' in 'demos/shout'. Expected output <class 'pexpect.exceptions.EOF'> not found.