Tune timeout for test targets ([]

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//third_party/java_src/gtld/javatests/google/registry/model:registry/label/GenrulePremiumListTest: We're adjusting the test target timeout because it has a 1.248050 percent time out rate based on last week's (2019-04-27 - 2019-05-04) tap postsubmit running statistics. Its original timeout_sec is 60, and we're adjusting it to moderate, which is 300 seconds.
Some detailed statistics for the target:
  Num of invocation: 641
  Num of passed invocations: 633
  Num of timeout invocations: 8
  ****** Stats for passing runs ******
    Min run time in secs: 14
    Max run time in secs: 57
    Mean run time in secs: 28.955766
    Sd run time in secs: 9.104767

#codehealth

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=246791200

javatests/google/registry/model/BUILD

@@ -46,6 +46,7 @@ java_library(
 
 GenTestRules(
     name = "GeneratedTestRules",
+    timeout = "moderate",
     medium_tests = ["registry/label/PremiumListTest"],
     test_files = glob([
         "*Test.java",