Change log:
dfd4235 Upgrade Spring Versions
f5517a0 Clear lock cache in NioFileLocker (#2998)
2b39fdd GH-2987: Add HTTPS entries for Twitter
ae75499 GH-2987: Add HTTPS entries into spring.schemas
c83e059 GH-2987: Add HTTPS entries into spring.schemas
eff39e5 PollerAdviceTests: synchronized list actions
11310ff Fix race condition around Redis key
eb31825 Fix Redis components for JDK deserialization
93cd669 GH-2974: Fix race in TcpNetConnection.getPayload()
8a4e733 Fix TimeUnit in ChannelInputStream.close()
756cd41 Fix MessagingGatewaySupport implementors
34bcd7d Synchronize RemoteFileUtils.makeDirectories()
05a50fe Downgrade H2 to 1.4.197
7af7109 Clean up more schema before JDBC tests
40f011b Drop H2 schema before JDBC tests