Merge branch 'stable-2.16' into stable-3.0
* stable-2.16:
ChangeNotificationsIT: Fix eclipse warning(s) about static use
CacheMetrics: Make F_NAME a final constant in class scope
Fix more cases where Collection.isEmpty() should be used
Use Set instead of EnumSet in method signatures
Replace negation of anyMatch() with noneMatch()
AllExternalIds: Replace lambdas with method references
PostReview: Replace filter and findFirst with anyMatch
XContentBuilder: Use UTF_8 from Java's StandardCharsets rather than Guava
Update git submodules
Update git submodules
Update git submodules
QueryDocumentationExecutor: Make WEIGHTS final and use ImmutableMap
BooleanProjectConfigTransformations: Make MAPPER final
TestSubmitRuleInfo: Make INSTANCE final
TrackingFootersProvider: Make constants final
ChangeCleanupConfig: Make constants final
SetParent: Simplify lambda expression
ProjectsConsistencyChecker: Simplify lambda expression
Remove redundant null checks used with "instanceof"
Remove unnecessary array creation for varargs parameters
Remove redundant parentheses in lambda statements
PreferencesBox: Remove unnecessary boxing to Boolean
GitwebServlet: Rename bufferSize to BUFFER_SIZE and make static
GetPatch: Make FILE_NOT_FOUND static
DeleteZombieCommentsRefs: Make constants static
AbstractNotificationTest: Make constants static and rename
TabFile: Make TRIM final
Remove redundant calls to toString()
OpenIdServiceImpl: Fix incorrect null comparison of Optional
Consistently use isEmpty to check for empty collection
PageLinks: Reuse ADMIN_PROJECTS constant
PageLinks: Fix typo in method name
FlushCaches: Use isEmpty to check for empty list
JGitMetricModule: Replace anonymous Supplier instances with method references
Adapt to deprecation of WindowCacheStats methods in JGit
Documentation: Fix collapsed words and broken link
Change-Id: I136c109013a8947ba530a52164e97af2775fe490
