CA-245811: Fix `assert_vm_supports_quiesce_snapshot` function
CA-245811: Fix `assert_vm_supports_quiesce_snapshot` function

List.filter_map on VBDs for checking `on_boot=reset` in vdi sm_config
gives non empty list, incorrectly.
Fix it to use List.exists instead.

Signed-off-by: Sharad Yadav <0ab5d8dd51ae0f2f9ed283cbbbb7a94d110e3347@citrix.com>

euanh/xen-api,Frezzle/xen-api,euanh/xen-api,euanh/xen-api,srowe/xen-api,srowe/xen-api,euanh/xen-api,Frezzle/xen-api,srowe/xen-api,Frezzle/xen-api,Frezzle/xen-api,srowe/xen-api,Frezzle/xen-api,euanh/xen-api,euanh/xen-api,srowe/xen-api