seleniumFixV2: connected thread pool creation to condition web.allowLuceneIndexing...

seleniumFixV2: connected thread pool creation to condition web.allowLuceneIndexing (otherwise thread pool will be kept open for more than a minute, what hinders the start of another gitblit instance in the same jvm during selenium test case execution), fixed naming of xpath variables, added missing property to gitblit.properties and test-ui-gitblit.properties, changed naming of methods (according to decision that owners is a much shorter word than repository administrator and that owners is fits better if you think of collective responsibilities and collective ownership)