Add retry for urlopen

[bssrikanth]

Many a times open url returns 503 errors, handling it by introducing retries.

Before:

[stdlog] 2024-12-02 16:42:53,814 avocado.utils.download download         L0096 INFO | Fetching https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/snapshot/master.tar.gz -> /root/avocado/data/cache/by_location/fb1b8783e9b605568767b2ad1c7c4e9a264d1085/kselftest.tar.f5c94290-8910-4763-88d7-8583bf659cd0
[stdlog] 2024-12-02 16:42:59,104 avocado.utils.download download         L0051 ERROR| Failed downloading file: The read operation timed out
[stderr] Failed to get file. Probably timeout was reached when connecting to the server.
[stdlog] 2024-12-02 16:42:59,109 avocado.utils.asset asset            L0165 INFO | Temporary asset file unavailable due to failed download attempt.

After:

[stdlog] 2024-12-02 02:00:50,228 avocado.utils.asset asset            L0152 DEBUG| Asset not in cache after lock, fetching it.
[stdlog] 2024-12-02 02:00:50,228 avocado.utils.download download         L0101 INFO | Fetching https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/snapshot/master.tar.gz -> /root/avocado/data/cache/by_location/fb1b8783e9b605568767b2ad1c7c4e9a264d1085/kselftest.tar.1a5eab69-aff0-4f99-a111-2f77e9b30f23
[stdlog] 2024-12-02 02:00:55,500 avocado.utils.download download         L0053 ERROR| Failed downloading file: The read operation timed out
[stdlog] 2024-12-02 02:00:55,501 avocado.utils.download download         L0055 DEBUG| retry attempt: 1
[stdlog] 2024-12-02 02:01:00,716 avocado.utils.download download         L0053 ERROR| Failed downloading file: The read operation timed out
[stdlog] 2024-12-02 02:01:00,717 avocado.utils.download download         L0055 DEBUG| retry attempt: 2
[stdlog] 2024-12-02 02:01:05,813 avocado.utils.download download         L0053 ERROR| Failed downloading file: The read operation timed out
[stdlog] 2024-12-02 02:01:05,813 avocado.utils.download download         L0055 DEBUG| retry attempt: 3
[stdlog] 2024-12-02 02:01:05,814 avocado.utils.download download         L0063 DEBUG| Opened URL "https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/snapshot/master.tar.gz" and received response with headers including: content-length UNKNOWN, date: "Sun, 01 Dec 2024 20:31:16 GMT", last-modified: "Sun, 01 Dec 2024 20:31:06 GMT"

[codecov]

Codecov Report

Attention: Patch coverage is 58.33333% with 5 lines in your changes missing coverage. Please review.

Project coverage is 68.67%. Comparing base (f452aa5) to head (1ecfb47).
Report is 9 commits behind head on master.

Files with missing lines	Patch %	Lines
avocado/utils/download.py	58.33%	5 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #6077       +/-   ##
===========================================
+ Coverage   54.47%   68.67%   +14.20%     
===========================================
  Files         202      202               
  Lines       21892    21899        +7     
===========================================
+ Hits        11925    15039     +3114     
+ Misses       9967     6860     -3107     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.