Capture enough lines for troubleshooting

[nobuto-m]

Follow-up of 9159cf5

20 lines are not enough sometimes to capture the real error or failure.
By having 200 lines we can cover most of the output from a single hook
execution. For example, the real DNS failure wasn't captured in Zaza
output but the full juju crashdump had to be downloaded to see those
lines.

unit.mysql-innodb-cluster/2.install logger.go:60 W: Failed to fetch
http://archive.ubuntu.com/ubuntu/dists/focal/InRelease Temporary failure
resolving 'archive.ubuntu.com'

unit.mysql-innodb-cluster/2.install logger.go:60
subprocess.CalledProcessError: Command '['apt-get',
'--option=Dpkg::Options::=--force-confold', '--assume-yes', 'install',
'python3-pip', 'python3-setuptools', 'python3-yaml', 'python3-dev',
'python3-wheel', 'build-essential']' returned non-zero exit status 100.

[codecov]

Codecov Report

Merging #518 (b6a5ab7) into master (1ec92a9) will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##           master     #518   +/-   ##
=======================================
  Coverage   89.00%   89.00%           
=======================================
  Files          44       44           
  Lines        4429     4429           
=======================================
  Hits         3942     3942           
  Misses        487      487           

Impacted Files	Coverage Δ
zaza/charm_lifecycle/func_test_runner.py	72.83% <0.00%> (ø)

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[nobuto-m]

Python package / func (pull_request) Failing after 1m — func

+ sudo snap install --classic juju
error: cannot perform the following tasks:
- Download snap "core18" (2409) from channel "stable" (received an unexpected http response code (503) when trying to download https://canonical-bos01.cdn.snapcraftcontent.com/download-origin/canonical-lgw01/CSO04Jhav2yK0uz97cr0ipQRyqg0qQL6_2409.snap?interactive=1&token=

A hiccup of the networking infrastructure I believe.

[ajkavanagh]

LGTM; the codecov warning, whilst annoying, means this function was never covered by tests; I don't think it's appropriate to ask for the test for this change.