Tests: Fix 'system_tests_quick.test_3_nodes_stop_all_start_slaves'

Test execution output::

    ERROR: arakoon_system_tests.server.quick.system_tests_basic.test_3_nodes_stop_all_start_slaves
    ----------------------------------------------------------------------
    Traceback (most recent call last):
      File "/opt/qbase3/lib/python2.6/site-packages/nose/case.py", line 186, in runTest
        self.test(*self.arg)
      File "/opt/qbase3/var/tests/arakoon_system_tests/server/system_tests_common.py", line 65, in decorate
        raise fatal_ex
    ArakoonNodeNotLocal: sturdy_3 is not a local node
    -------------------- >> begin captured logging << --------------------
    root: INFO: Creating data base dir /opt/qbase3/var/tmp/arakoon_system_tests/test_3_nodes_stop_all_start_slaves
    root: INFO: Using master election
    root: INFO: Creating client config
    root: INFO: Changing log level to debug for all nodes
    root: INFO: Setting lease expiration to 8
    root: INFO: Starting cluster
    root: DEBUG: calling: ['/opt/qbase3/apps/arakoon/bin/arakoon', '--node', 'sturdy_0', '-config', '/opt/qbase3/cfg/qconfig/arakoon/sturdy/sturdy.cfg', '-daemonize']
    root: DEBUG: calling: ['/opt/qbase3/apps/arakoon/bin/arakoon', '--node', 'sturdy_1', '-config', '/opt/qbase3/cfg/qconfig/arakoon/sturdy/sturdy.cfg', '-daemonize']
    root: DEBUG: calling: ['/opt/qbase3/apps/arakoon/bin/arakoon', '--node', 'sturdy_2', '-config', '/opt/qbase3/cfg/qconfig/arakoon/sturdy/sturdy.cfg', '-daemonize']
    root: INFO: Setup complete
    root: INFO: stop_all
    root: DEBUG: stopping 'sturdy_0' with: pkill -fx /opt/qbase3/apps/arakoon/bin/arakoon --node sturdy_0 -config /opt/qbase3/cfg/qconfig/arakoon/sturdy/sturdy.cfg -daemonize
    root: DEBUG: stopping 'sturdy_1' with: pkill -fx /opt/qbase3/apps/arakoon/bin/arakoon --node sturdy_1 -config /opt/qbase3/cfg/qconfig/arakoon/sturdy/sturdy.cfg -daemonize
    root: DEBUG: stopping 'sturdy_2' with: pkill -fx /opt/qbase3/apps/arakoon/bin/arakoon --node sturdy_2 -config /opt/qbase3/cfg/qconfig/arakoon/sturdy/sturdy.cfg -daemonize
    root: DEBUG: calling: ['/opt/qbase3/apps/arakoon/bin/arakoon', '--node', 'sturdy_0', '-config', '/opt/qbase3/cfg/qconfig/arakoon/sturdy/sturdy.cfg', '-daemonize']
    root: DEBUG: calling: ['/opt/qbase3/apps/arakoon/bin/arakoon', '--node', 'sturdy_1', '-config', '/opt/qbase3/cfg/qconfig/arakoon/sturdy/sturdy.cfg', '-daemonize']
    root: CRITICAL: Traceback (most recent call last):
      File "/opt/qbase3/var/tests/arakoon_system_tests/server/system_tests_common.py", line 56, in decorate
        func(*args,**kwargs)
      File "/opt/qbase3/var/tests/arakoon_system_tests/server/quick/system_tests_basic.py", line 400, in test_3_nodes_stop_all_start_slaves
        C.startOne( slave )
      File "/opt/qbase3/var/tests/arakoon_system_tests/server/system_tests_common.py", line 349, in startOne
        cluster.startOne(name)
      File "/opt/qbase3/lib/pymonkey/extensions/arakoon/server/ArakoonManagement.py", line 822, in startOne
        self._requireLocal(nodeName)
      File "/opt/qbase3/lib/pymonkey/extensions/arakoon/server/ArakoonManagement.py", line 814, in _requireLocal
        raise ArakoonNodeNotLocal( nodeName)
    ArakoonNodeNotLocal: sturdy_3 is not a local node

    root: INFO: basic_teardown(False)
    root: INFO: Stopping arakoon daemons for cluster sturdy
    root: INFO: stop_all
    root: DEBUG: stopping 'sturdy_0' with: pkill -fx /opt/qbase3/apps/arakoon/bin/arakoon --node sturdy_0 -config /opt/qbase3/cfg/qconfig/arakoon/sturdy/sturdy.cfg -daemonize
    root: DEBUG: stopping 'sturdy_1' with: pkill -fx /opt/qbase3/apps/arakoon/bin/arakoon --node sturdy_1 -config /opt/qbase3/cfg/qconfig/arakoon/sturdy/sturdy.cfg -daemonize
    root: DEBUG: stopping 'sturdy_2' with: pkill -fx /opt/qbase3/apps/arakoon/bin/arakoon --node sturdy_2 -config /opt/qbase3/cfg/qconfig/arakoon/sturdy/sturdy.cfg -daemonize
    root: INFO: Teardown complete
    --------------------- >> end captured logging << ---------------------
Tests: Harden process counting

This should harden system_tests_quick.test_start_stop_three_nodes_forced.
Turns out 'q.system.checkProcess' is not foolproof.
Tests: Fix system_tests_slow_left

 * test_torture.test_shaky_slave
 * test_torture.test_fat_shaky_slave