packer: isotime is launch time [GH-1153]

CHANGELOG.md

@@ -10,6 +10,7 @@ IMPROVEMENTS:
 
 BUG FIXES:
 
+  * core: `isotime` is the same time during the entire build. [GH-1153]
   * builder/parallels: Do not delete entire CDROM device. [GH-1115]
   * builder/virtualbox-ovf: Supports guest additions options. [GH-1120]
   * builder/vmware: Remote ESXi builder now uploads floppy. [GH-1106]

packer/config_template.go

@@ -111,7 +111,7 @@ func templateEnv(n string) string {
 }
 
 func templateISOTime() string {
-	return time.Now().UTC().Format(time.RFC3339)
+	return InitTime.Format(time.RFC3339)
 }
 
 func templatePwd() (string, error) {