parallels: introduce vz driver constant and string

This new name and constant will be used as substitutions for parallels driver one.
Signed-off-by: NMaxim Nestratov <mnestratov@parallels.com>

src/conf/domain_conf.c

@@ -118,7 +118,8 @@ VIR_ENUM_IMPL(virDomainVirt, VIR_DOMAIN_VIRT_LAST,
               "vbox",
               "phyp",
               "parallels",
-              "bhyve")
+              "bhyve",
+              "vz")
 
 VIR_ENUM_IMPL(virDomainOS, VIR_DOMAIN_OSTYPE_LAST,
               "hvm",

src/conf/domain_conf.h

@@ -223,6 +223,7 @@ typedef enum {
     VIR_DOMAIN_VIRT_PHYP,
     VIR_DOMAIN_VIRT_PARALLELS,
     VIR_DOMAIN_VIRT_BHYVE,
+    VIR_DOMAIN_VIRT_VZ,
 
     VIR_DOMAIN_VIRT_LAST
 } virDomainVirtType;