libs: update nfs4j to 0.7.0

fixes compatibility with rhel7 and linux kernels > 3.11
provides functionality required by proxy IO

Changelog for nfs4j-0.6.3..nfs4j-0.7.0
    * [ffcf8a9] vfs: update API interface to match new changes in chimera
    * [3252e04] nfsv3: fix creation of symbolic link
    * [f3a8db4] nfsv3: fix hard link creation (similar to http://rb.dcache.org/r
    * [a3642de] src: keep style check happy
    * [89346e7] nfsv4: remove dead code
    * [6e7cd2a] vfs: chimera: avoid extra db lookup
    * [cc22d5c] test: do not use obsolete ip host name
    * [5958f97] nfsv4: add state dispose listener
    * [1e946d2] core: implement missing SECINFO_NO_NAME
    * [03201b8] pom: update liquibase-core to 3.0.8

Acked-by: Gerd Behrmann
Target: master, 2.7, 2.6
Require-book: no
Require-notes: no

pom.xml

@@ -782,7 +782,7 @@
         <dependency>
             <groupId>org.dcache</groupId>
             <artifactId>nfs4j-core</artifactId>
-            <version>0.6.3</version>
+            <version>0.7.0</version>
             <exclusions>
                 <exclusion>
                     <groupId>org.dcache.chimera</groupId>