MINIFICPP-2727 Stabilize verify package tests

[lordgamez]

• Remove volatile repository test for non-alpine distros, as memory management is different with glibc allocator and checking memory usage in the process does not reflect the actual memory usage of the repository
• Do not cache errors in HTTP proxy, because transient initial connection errors can cause the proxy to always return the same error code even after establishing the connection

https://issues.apache.org/jira/browse/MINIFICPP-2727

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