Suppress test set-up and tear-down in callgrind parent process

When running a test using -callgrind, we recurse into a child process,
run under valgrind, to which we pass -callgrindchild; and we only want
the output from the child process, since the parent won't actually be
running any tests. We also won't be using the global data table for
the test in the parent process. So bypass the set-up and tear-down of
both logging and the global data table in the parent process.

Prior to commit 3ee6d8d336db2d9d15818b234ce16531ea0cdd48, these parts
of the set-up and tear-down were skipped in the callgrind parent
process, but that refactoring split qExec() up into qInit(), qRun()
and qCleanup() to enable QtQuick to recombine them to implement an
equivalent of qExec(), calling qRun() once for each built-in style. It
needs these pieces of set-up to happen in qInit(), and of tear-down in
qCleanup(), to avoid repeating them for each style. Leave a comment in
qExec() that might help future readers to understand why it's done the
way it is.

Change-Id: Ieaca9a125c713b8fcf8dec8f9be0c024a798d504
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>

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