chimera: fix rename into a file

fix confitions when file is remove into an existing file
as a parent.

Ticket: #8250
Acked-by: Paul Millar
Target: master, 2.8, 2.7, 2.6
Require-book: no
Require-notes: yes
libs: update nfs to 0.7.4

minor bugfix to support chimera's rename fixes

Changelog for nfs4j-0.7.3..nfs4j-0.7.4
    * [b11ec2a] nfs4: fix lookupp on the root of the tree
    * [f99922b] nfs4: fix handling of illegal operations
    * [5646570] vfs: chimera: translate exceptions to nfs errors

Acked-by: Gerd Behrmann
Target: master, 2.8, 2.7
Require-book: no
Require-notes: no
chimera: fix transaction leak

introduced in 119ecfe92c1a69925ad31934f7517421e3f74405

Acked-by: Paul Millar
Target: master
Require-book: no
Require-notes: no
delegation: initial support

This patch adds support for grid-site delegation.  The end-point is the
same as the SRM endpoint, so any SRM client can discover the end-point
trivially.