[KVM] The qemu ‘-cpu’ option not have skylake server cpu model

[Robert Hu]

Environment:
-------------------
KVM commit/branch: bd17117b/next
Qemu commit/branch: cd1ea508/master
Host OS: RHEL7.3 ia32e
Host Kernel:4.11.0-rc3
Bug detailed description:
----------------------------------
In latest qemu commit the qemu still not have skylake server cpu model
Reproduce steps:
-------------------------
[root@skl-2s2 ~]# qemu-system-x86_64 -cpu help
Available CPUs:
x86 486
x86 Broadwell-noTSX Intel Core Processor (Broadwell, no TSX)
x86 Broadwell Intel Core Processor (Broadwell)
x86 Conroe Intel Celeron_4x0 (Conroe/Merom Class Core 2)
x86 Haswell-noTSX Intel Core Processor (Haswell, no TSX)
x86 Haswell Intel Core Processor (Haswell)
x86 IvyBridge Intel Xeon E3-12xx v2 (Ivy Bridge)
x86 Nehalem Intel Core i7 9xx (Nehalem Class Core i7)
x86 Opteron_G1 AMD Opteron 240 (Gen 1 Class Opteron)
x86 Opteron_G2 AMD Opteron 22xx (Gen 2 Class Opteron)
x86 Opteron_G3 AMD Opteron 23xx (Gen 3 Class Opteron)
x86 Opteron_G4 AMD Opteron 62xx class CPU
x86 Opteron_G5 AMD Opteron 63xx class CPU
x86 Penryn Intel Core 2 Duo P9xxx (Penryn Class Core 2)
x86 SandyBridge Intel Xeon E312xx (Sandy Bridge)
x86 Skylake-Client Intel Core Processor (Skylake)
x86 Westmere Westmere E56xx/L56xx/X56xx (Nehalem-C)
x86 athlon QEMU Virtual CPU version 2.5+
x86 core2duo Intel(R) Core(TM)2 Duo CPU T7700 @ 2.40GHz
x86 coreduo Genuine Intel(R) CPU T2600 @ 2.16GHz
x86 kvm32 Common 32-bit KVM processor
x86 kvm64 Common KVM processor
x86 n270 Intel(R) Atom(TM) CPU N270 @ 1.60GHz
x86 pentium
x86 pentium2
x86 pentium3
x86 phenom AMD Phenom(tm) 9550 Quad-Core Processor
x86 qemu32 QEMU Virtual CPU version 2.5+
x86 qemu64 QEMU Virtual CPU version 2.5+
x86 base base CPU model type with no features enabled
x86 host KVM processor with all supported host features (only available in KVM mode)
x86 max Enables all features supported by the accelerator in the current host

[Peter Maydell (pmaydell)]

The Skylake-Server cpu type was added for either QEMU 3.0 or 3.1, so this bug is fix-released.