Tags: cywzl/xen-4.4

Update Xen version to 4.2.0-rc4

Added signature for changeset 68640a3c99ce

Update Xen version to 4.2.0-rc3

Update Xen version to 4.2.0-rc2

Update Xen version to 4.2.0-rc1

Merge

Update Xen version to 4.1.0-rc6

Update Xen version to 4.1.0-rc5

Update Xen version to 4.1.0-rc4

Update QEMU_TAG to xen-4.1.0-rc3