Do not drop kernel cmdline for xen pv domains
Kernel cmdline args can be passed to xen pv domains even when a bootloader is specified. The current config-to-sxpr mapping ignores cmdline when bootloader is present. Since the xend sub-driver is used with many xen toolstack versions, this patch takes conservative approach of adding an else block to existing !def->os.bootloader, and only appends sxpr if def->os.cmdline is non-NULL. V2: Fix existing testcase broken by this patch and add new testcases
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