ComponentTool: faster reload of test components

When editing a test component, only reload test component module, no
need to reload all components modules because other modules do not
depend on test module.
Status Job ID Name Coverage
  External
passed ERP5.CodingStyleTest-TestRunner2

failed ERP5.UnitTest-TestRunner2

02:42:03

passed ERP5.CodingStyleTest-TestRunner2

01:49:33

passed ERP5.CodingStyleTest-TestRunner2

passed ERP5.CodingStyleTest-TestRunner2

01:43:58

passed ERP5.CodingStyleTest-TestRunner2

01:30:17

failed ERP5.UnitTest-TestRunner2

03:02:21

passed ERP5.UnitTest-TestRunner2

03:19:00