SL-18837: Set APR_LOG once for the whole job

instead of a new value for each LLProcess::create() invocation.

Since the internal apr_log() function only looks at APR_LOG once per process,
the first test (which succeeded, hence no log file dump) left the log file
open with that same original pathname. Resetting the APR_LOG environment
variable for subsequent runs only made the new code in llprocess_test look for
files that were never created.

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