tests (e2e/cli/cache_search): make the test more resilient: the caching is triggered by `li.blog.get`, but it is done in parallel without blocking the command, thus there is a possibility that the data is not yet in cache when the following test is done. A loop with delay is done, to be sure that cache is filled before doing the assertion.

You'll find install instructions in documentation (see doc/installation.rst).

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