PB now accommodates "lpa" and "lpr" responses as well as "af ls"

The test relies on this order.

The new default is 10 for unit tests.
The number is set by the frontend, which is the only process where it matters. The default
in the configuration file is set to 500 for CI tests.

The requeust is now created first so the data is safe before returning to the caller.
Also improved the timing logging.

This version is not data safe as the request is created late, right after
referencing the job to the queue.

The size is set to 500 to allow unit tests to pass.
Next steps are: port the mechanism to retrieve, and make the thread pool size configurable.

The top half goes as far as when the request is safe in the object store.
At that point, the bottom half is launched in a new thread, and success is returned
the called. This will enable lower latency for the users while retaining
the same data safety.

This version is experimental aas it spans an undetermined number of threads. A more controlled
version with a work queue should be implenented on the long run.

Fixed.

Kept the initial algorithm too and created a selection function.

The steps are now base RPMs, EOS and then scripts. This allows faster testing
of new EOS versions.

This multiline string did not go well stored as an extended attribute in EOS.

The situation can happen if the queue was removed but not yet derefernced from the
root entry while another process tries access the queue. This a race condition.
The process trying to access the queue will proceed the with cleanup itself
and retry.

This allows attaching a debugger to the main process.

We should not overwrite the user /etc/sysconfig/cta-taped as it contains site specific configuration

TimeBasedCache::getCachedValue() now returns a stale value if another thread is already determing the new fresh value