Buck: Make acceptance tests valid java class names

This is a preparation change to support Bazel build for Gerrit.
In Bazel we need to generate Test Suite class per java_test rule
instance. For that the name of java_test rule must be valid
java class name. Harmonize the naming convention for Buck too.

Change-Id: I7da30469487d1bc0335800070e0ab488236c5357

gerrit-acceptance-tests/src/test/java/com/google/gerrit/acceptance/server/change/BUCK

@@ -1,7 +1,7 @@
 include_defs('//gerrit-acceptance-tests/tests.defs')
 
 acceptance_tests(
-  group = 'server-change',
+  group = 'server_change',
   srcs = glob(['*IT.java']),
   labels = ['server'],
 )

gerrit-acceptance-tests/src/test/java/com/google/gerrit/acceptance/server/event/BUCK

@@ -1,7 +1,7 @@
 include_defs('//gerrit-acceptance-tests/tests.defs')
 
 acceptance_tests(
-  group = 'server-event',
+  group = 'server_event',
   srcs = glob(['*IT.java']),
   labels = ['server'],
 )

gerrit-acceptance-tests/src/test/java/com/google/gerrit/acceptance/server/notedb/BUCK

@@ -1,7 +1,7 @@
 include_defs('//gerrit-acceptance-tests/tests.defs')
 
 acceptance_tests(
-  group = 'server-notedb',
+  group = 'server_notedb',
   srcs = glob(['*IT.java']),
   labels = ['notedb', 'server'],
 )

gerrit-acceptance-tests/src/test/java/com/google/gerrit/acceptance/server/project/BUCK

@@ -3,13 +3,13 @@ include_defs('//gerrit-acceptance-tests/tests.defs')
 FLAKY_TEST_CASES=['ProjectWatchIT.java']
 
 acceptance_tests(
-  group = 'server-project',
+  group = 'server_project',
   srcs = glob(['*IT.java'], excludes=FLAKY_TEST_CASES),
   labels = ['server'],
 )
 
 acceptance_tests(
-  group = 'server-project-flaky',
+  group = 'server_project_flaky',
   srcs = FLAKY_TEST_CASES,
   labels = ['server', 'flaky'],
 )