Xenapi

* CP-5113: Queue VM.unpause immediately after VM.start
* CA-109295: Allow other_config:hvm_serial to set values other than "pty"
* CA-108913: Initialise parameters on the stack
* Don't automatically install rrdd-devel packages
* Do not try deleting the old xenguest log file
* CA-101777: some improvements on metadata backup/restore
* CA-100685: When domain disappears during VM shutdown, just do it w/ no error
* CA-104674: Don't add genid to VMs that don't need one
* Add scripts to help maintain version tags and changelog entries
* CA-93557: Fix poor performance for VMs in 'Restart' vs 'Restart if possible'
* networkd: do signal xapi when an IP address is removed
* CP-5095:Retrieve a list of SRs required to recover a VM through xapi
* CA-98077: Block SXM when VM has a VDI with on_boot=reset
* CA-108515: Prevent the destruction of SR configured as IntelliCache SR

* Initial changelog entry, more to come after sprint wk28

* storage: plugging on a slave before a master is now an error
* xenvmd is restarted over master transitions
* preliminary support for SR-level RRDs
* storage: a plugin can have cluster stack constraints
* support for a windows VM drivers upgrade tool 'xenprep'
* change queue prefix to org.xen.xapi
* add XenAPI extension mechanism
* add LVHD thin provisioning upgrade API
* support polling modes for VBDs
* storage: a plugin can report cluster/mirror health
* storage: many updates to SMAPIv3
* storage: generate an alert when a cluster/mirror is degraded
* storage: add rawhba and lvmofcoe to the whitelist
* fix `sm-cli mirror-list`

* add originator for `login_with_password`
* new API: VM.import
* new CLI: VM import from URL
* initial support for thin provisioning on block storage
* lots of VGPU improvements
* allow storage motion of halted VMs
* support for TLS 1.2
* initial support for FCoE
* preliminary support for SMAPIv3
* preliminary support for multiple cluster stacks
* new CLI support for reading database dumps

* fix release_version of get_SRs_required_for_recover
* support SM backend-kind override via VDI.other_config key
* support floppy disk drives
* when performing a snapshot, set is_a_snapshot
* update API version to 2.4
* don't double-count HA-protected VMs when restarting them
* don't create refs for snapshots that don't exist on import
* expose RDP state, via guest agents, via VM guest metrics
* read all paths from the config file
* use 'ip' rather than 'ifconfig'
* block the pool-join if the joining host has a network bond
* use local force_state_reset after cross-pool SMX
* correct error text for assert_no_shared_srs_on_me
* allow ISO VBDs to be made from any SR
* disallow resume while a checkpoint is ongoing
* don't pause tapdisk
* use oclock rather than Unix.time
* import_raw_vdi: pass content-length to vhd-tool
* update hostname when it changes
* allow WLB servers to have an IPv6 address
* make sure we return the task reference when cancelling a task
* python: fix compatibility with python 2.7
* add a plugin to install supplemental packs
* create a PGPU for the system display device
* allow PCI vendors to be whitelisted for GPU passthrough
* allow passthrough of vga_arbiter device when appropriate
* remove VM hooks which are now handled by xenopsd
* set the content-length and close the tar header when exporting metadata
* handle cancellation of cross-host VDI.copy
* prevent VM.revert deleting all VDIs unconditionally
* update VDI.snapshot_of links after a VM.revert
* support for read-caching
* check for enough disk space before installing hotfixes
* VM.hard_reboot cancels VM.clean_reboot

* examples: wrap task.destroy with an exception handler
* add GC stats reporting
* support a "feature-suspend" flag
* fix HTTP requests with an empty cookie
* add opam file
* add documentation
* update to new backtrace API
* xe: add "--trace" option to print backtraces
* add license check for vGPU
* run migration pre-checks for VDI.pool_migrate
* tidy up the internal database interface