Try to bring up networks and storage pools more eagerly at first

[simondeziel]

Instead of waiting a fixed 60 seconds between retries, it now starts with shorter 5-second intervals and gradually increases the delay until reaching the 60-second cap.

Here's what it looks like in the test script:

+ ip link del foo
+ echo '==> Networks will appear ready after the next retry'
==> Networks will appear ready after the next retry
++ lxd waitready --network --storage --timeout 15
ERROR  [2025-09-16T14:42:52Z] Failed mounting storage pool                  err="Failed to create storage pool directory \"/tmp/lxd-test.tmp.yLzr/8QH/storage-pools/lxdtest-8QH-pool\": mkdir /tmp/lxd-test.tmp.yLzr/8QH/storage-pools/lxdtest-8QH-pool: not a directory" pool=lxdtest-8QH-pool
INFO   [2025-09-16T14:42:52Z] Initialized network                           name=lxdt9577 project=default
INFO   [2025-09-16T14:42:52Z] All networks initialized                     
ERROR  [2025-09-16T14:43:02Z] Failed mounting storage pool                  err="Failed to create storage pool directory \"/tmp/lxd-test.tmp.yLzr/8QH/storage-pools/lxdtest-8QH-pool\": mkdir /tmp/lxd-test.tmp.yLzr/8QH/storage-pools/lxdtest-8QH-pool: not a directory" pool=lxdtest-8QH-pool
+ '[' 'Error: Storage pools not ready yet after 15s timeout' = 'Error: Storage pools not ready yet after 15s timeout' ']'

The test's runtime goes from ~125s to ~35s.

[Copilot]

Pull Request Overview

This PR improves the startup behavior of LXD networks and storage pools by implementing a more aggressive retry strategy during initialization. Instead of waiting a fixed 60 seconds between retries, the system now starts with shorter 5-second intervals and gradually increases the delay until reaching the 60-second cap.

Key changes:

• Implements exponential backoff for network and storage pool initialization retries
• Reduces test timeouts from 80 seconds to 15 seconds to match the improved retry behavior
• Significantly improves test runtime from ~125s to ~35s

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
lxd/storage.go	Adds exponential backoff logic for storage pool initialization retries
lxd/networks.go	Adds exponential backoff logic for network initialization retries
test/suites/waitready.sh	Updates test timeouts and comments to reflect the new retry behavior

[tomponline]

Please can you de-dupe that wait logic, some sort of backoff function?