fix t06_publish/PublishSnapshot43Test_gold gold error

[xzhang1]

Fixes #

Requirements

Description of the Change

Without this fix make docker-system-test failed as:

. t06_publish   ➔ PublishSnapshot43Test               FAIL      2s
running command: aptly snapshot create snap43 from mirror gnuplot-maverick

Exception: content doesn't match:
--- 
+++ 
@@ -5,7 +5,7 @@
 Generating metadata files and linking package files...
 Loading packages...
 Now you can add following line to apt sources:
-Please setup your webserver to serve directory '/home/runner/.aptly/public' with autoindexing.
+Please setup your webserver to serve directory '/var/lib/aptly/.aptly/public' with autoindexing.
 Signing file 'Release' with gpg, please enter your passphrase when prompted:
 Snapshot snap43 has been successfully published.
 You can also use `aptly serve` to publish your repositories over HTTP quickly.
...

Checklist

• allow Maintainers to edit PR (rebase, run coverage, help with tests, ...)
• unit-test added (if change is algorithm)
• functional test added/updated (if change is functional)
• man page updated (if applicable)
• bash completion updated (if applicable)
• documentation updated
• author name in AUTHORS

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.64%. Comparing base (a65f79e) to head (dc07b81).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1531      +/-   ##
==========================================
- Coverage   76.96%   76.64%   -0.32%     
==========================================
  Files         160      160              
  Lines       14754    14754              
==========================================
- Hits        11355    11308      -47     
- Misses       2266     2317      +51     
+ Partials     1133     1129       -4     

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