Eclipse JGit: Java implementation of Git 4.9.4

Bug Fixes

• 537969 Fix atomic lock file creation on NFS configured via option core.supportsAtomicCreateNewFile
• GC: Avoid logging errors when deleting non-empty folders
• Fix GC run in foreground to not use executor
• 537872 Suppress warning which was logged when fetching with option --prune with a stale remote branch tries to delete non-empty directory
• 529400 Fix fetching with duplicate ref updates
• 529314 Fetch(Process): should tolerate duplicate refspecs

Build and Release Engineering

• Fix photon target platform to use photon version of org.eclipse.osgi
• Update Photon orbit repository to R20180606145124