domcaps: Treat host models as case-insensitive strings

Qemu 2.11 allows case-insensitive specification of CPU models.
This patch fixes the resulting problems on (at least) POWER
arch machines so that Power8 and POWER8 are not different.
Signed-off-by: NScott Garfinkle <scottgar@linux.vnet.ibm.com>

src/conf/domain_capabilities.c

@@ -271,7 +271,7 @@ virDomainCapsCPUModelsGet(virDomainCapsCPUModelsPtr cpuModels,
         return NULL;
 
     for (i = 0; i < cpuModels->nmodels; i++) {
-        if (STREQ(cpuModels->models[i].name, name))
+        if (STRCASEEQ(cpuModels->models[i].name, name))
             return cpuModels->models + i;
     }