[xenserver|docs] Added XenServer provider specific ChangeLog

Handcrafted with love.

lib/fog/xenserver/CHANGELOG.md

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+# 1.9.0 XX/XX/XXXX (XenServer ChangeLog)
+
+* Added missing HostCpu model
+
+  So you can retrieve things like the CPU model, speed, flags
+  utilisation, vendor, etc.
+
+  See http://docs.vmd.citrix.com/XenServer/6.0.0/1.0/en_gb/api/?c=host_cpu
+
+* Host model improvements 
+
+  Added missing host attributes:
+
+  - edition
+  - software_version
+  - enable
+  - disable
+  - shutdown
+  - reboot
+
+  See http://docs.vmd.citrix.com/XenServer/6.0.0/1.0/en_gb/api/?c=host
+
+* PBD model improvements
+
+  - Added missing currently_attached attribute
+  - A PBD can be unplugged now
+
+  See http://docs.vmd.citrix.com/XenServer/6.0.0/1.0/en_gb/api/?c=PBD
+
+* StorageRepository model improvements
+
+  - Added missing create/destroy/save operations
+  - Added missing generic set_attribute method
+  
+  See http://docs.vmd.citrix.com/XenServer/6.0.0/1.0/en_gb/api/?c=SR
+
+* Pool model improvements 
+
+  - Added missing suspend_image_sr attribute
+  - Added default_sr getter/setter
+  - Added suspend_image_sr getter/setter
+  - Added generic set_attribute method
+
+  See http://docs.vmd.citrix.com/XenServer/6.0.0/1.0/en_gb/api/?c=pool
+
+* Switch to nokogiri XML parser
+
+  Use Nokogiri instead of slow REXML for parsing, greatly improving
+  parsing time under some ruby implementations.
+
+* Greatly improved documentation
+
+  New tutorials included with the provider:
+
+  - Getting started: the compute service
+  - How To Change the Default Storage Repository to File-based VHD-on-EXT3
+  - Example that covers a Citrix KB ctx116324 article
+  - Creating servers (VMs) and templates
+  - Managing Storage Repositories
+
+  See https://github.com/fog/fog/tree/master/lib/fog/xenserver/examples
+
+* Added missing HostMetrics model
+
+  Retrieve the metrics associated with a host.
+
+  See http://docs.vmd.citrix.com/XenServer/6.0.0/1.0/en_gb/api/?c=host_metrics
+
+* Fixed authentication issues when using numeric-only passwords
+
+* Better test coverage