apply code review recommendations

src/test/java/api/test/rest/RestGeneralStepDefinitions.java

...st/java/api/test/rest/tsa/cache/CacheStepDefinitions.java

.../java/api/test/rest/tsa/policy/PolicyStepDefinitions.java

.../java/api/test/rest/tsa/signer/SignerStepDefinitions.java

...test/java/api/test/rest/tsa/task/TaskStepDefinitions.java

...y/policy/{group}/{name}/{version}/evaluation/POST.feature

...olicy/policy/{group}/{name}/{version}/lock/DELETE.feature

.../policy/policy/{group}/{name}/{version}/lock/POST.feature

...rces/features/tsa/task/v1/task/taskListStatus/GET.feature

...esources/features/tsa/task/v1/task/taskResult/GET.feature