fix defect #4307 [FVT]:chdef newimage -u give out wrong arch in ubuntu; fix defect #4345 Utils->osver routine does not support Redhat7 or SLES12;fix defect #4308 [FVT]: osarch default value of user defined osimage is ppc64le. needs to change to ppc64el
fix bug 4410: Command genimage failed on Ubuntu 14.04.1 ppc64el with kernelver attribute
fix bug 4424: Failed to genimage for Ubuntu 14.10 diskless node on ppc64el
fix bug 4415: Ubuntu 14.10 diskfull installation failed on IBM PowerKVM guest