Use cmake 3.8
Use cmake 3.8

* In lynx, cmake 3.8 is required to build rpm package according to
  user specificied spec file.

Change-Id: Ic92b61e239d8a0641315f4372fb4f14f9eff6461
Signed-off-by: Jason Tang <7bffd3ac92c799ededc488fc8ffb5bbc75b0893d@emc.com>
Reviewed-on: https://gerrit.mozy.lab.emc.com/115223
Reviewed-by: Robin Li <939f7ce13a9f2f4769665f7036e5ca33b9bdcfa8@emc.com>

mozy/mordor,mozy/mordor,mozy/mordor