Fix for CLOUDSTACK-5864

Fixed the mentioned issue.

Signed-off-by: Santhosh Edukulla <Santhosh.Edukulla@citrix.com>
Merge branch '4.3' of https://git-wip-us.apache.org/repos/asf/cloudstack into 4.3
Fix typo
update xen/kvm system vm template download url, and update the os type to 64bit
add md5sum for xen/kvm system vm template
CLOUDSTACK-5696: fix a regression caused by out-of-band sync changes
CLOUDSTACK-5877: ListTemplates does not sort based on sort_key.
CLOUDSTACK-5408 [Automation] Failed to deploy vm in vmware environment with error "due to java.io.IOException: Cannot run program "mount": java.io.IOException: error=12, Cannot allocate memory"

Bump up RAM size of system offering for SSVM to 512MB. Fix if default service offering is already not present.

Signed-off-by: Sateesh Chodapuneedi <sateesh@apache.org>
CLOUDSTACK-5395: mark snapshot_store_ref as destroyed in case of backup snapshot failed
CLOUDSTACK-5880: Communication between management server and hyper-v agent should be secure.
CLOUDSTACK-5883 Improve error handling to get the real error
CLOUDSTACK-5868 Default templates are still referring to older templates in DB

Updated URL and bits for 64-bit system vm template for VMware.

Signed-off-by: Sateesh Chodapuneedi <sateesh@apache.org>
CLOUDSTACK-5873: [Automation] Failed to attach volume to VM, if the vm is created with option startvm=false