nfs4j-0.23.0

Feature release with the following highlights:

• better nfs v4.x performance of state validation in highly concurrent environment
• use of oncrpc-3.2.0
• support of file creation attribute (see: https://github.com/dCache/nfs4j/blob/master/API-changes.md#023)
• simplification of various attribute types
• initial support for server-side-copy

Changelog for nfs4j-0.22.0..nfs4j-0.23.0
* [b4af4c3] [maven-release-plugin] prepare for next development iteration
* [ac82ca1] nfs4: fix typo in comments
* [8ede287] nfsv4.1: resulting notification bitmap should match requests length
* [6580dff] docs: added rfc7862 (NFSv4.2)
* [9c32099] nfs: remove throws from HostNameMatcher constructor
* [ea6f71a] nfs3: fix readdir entry size calculation
* [44fa34c] nfs4: improve state handler concurrency
* [207eeb3] pom: enforce https when accessing maven repos
* [521abf6] nfsv41: remove unused Layouts class
* [1ec8725] nfs4-client: show layout types supported by the server
* [d2ed5a5] src: fix formatting of AttributeMap
* [11b19a6] nfs4-client: CompoundBuilder#withGetdeviceinfo should accept layout type
* [2056c67] nfsv3: simplify size3 object
* [235e266] nfsv3: simplify uid3, gid3 objects
* [1ec32c5] nfsv3: merge NameUtils and HimeraNfsUtils into single class
* [8772820] docs: fix maven repo link in README.md
* [de0a8d4] nfsv3: remove unnecessary call of Inode#toString for logging
* [b1956be] src: don't use guava's Files#asCharSink
* [91b31e0] nfsv42: initial support for intra-server copy
* [4c7e1fe] nfsv42: add copy-offload notification collback to the back channel
* [fde8701] nfs4: include ACE flags in toString method
* [0d9f5ff] nfs4: simplify aceflag4 acemask4 acetype4 classes
* [dfd3ec8] client: fix desired file attributes propagation on create
* [3956d03] Allow virtual filesystem to check user subject.
* [1e0a4bd] libs use oncrpc-3.2.0
* [7d670d7] vfs: expose files creation (birth) time
* [55c7b2d] vfs: fix commit 7d670d7
* [b23268d] tests: add Stat#set/getBtime test
* [b12dbeb] vfs: add javadoc to org.dcache.nfs.vfs.Stat
* [67da932] vfs: drop Stat#get/setFileId methods
* [20968d2] tests: fix spelling of methods in StatTest
* [5541044] nfsv42: update OperationCOPY to support async copy
* [7a091ba] src: dont use guava's Sets
* [4a38d55] [maven-release-plugin] prepare branch 0.23
* [899d43d] [maven-release-plugin] prepare release nfs4j-0.23.0