version: compute SemVer from rawVersion

A bug in the SDK prevents us from calling SemVer on the PluginVersion
derived from the rawVersion, as when doing so, we reset the semVer
attribute to only use the core part of the version, thereby dropping any
information on pre-release/metadata.

This is not ideal, and arguably not wanted. So in order to not lose this
information, we re-compute the SemVer from rawVersion, this way we don't
overwrite it for both structures.

version/version.go

@@ -54,7 +54,11 @@ func init() {
 	rawVersion = strings.TrimSpace(rawVersion)
 
 	PackerVersion = pluginVersion.NewRawVersion(rawVersion)
-	SemVer = PackerVersion.SemVer()
+	// A bug in the SDK prevents us from calling SemVer on the PluginVersion
+	// derived from the rawVersion, as when doing so, we reset the semVer
+	// attribute to only use the core part of the version, thereby dropping any
+	// information on pre-release/metadata.
+	SemVer, _ = version.NewVersion(rawVersion)
 
 	Version = PackerVersion.GetVersion()
 	VersionPrerelease = PackerVersion.GetVersionPrerelease()