msl: Support for v-xx.xx.xx format version ID

The version ID of the pnor we have released is
similar to the following format.

Inspur-Dubai-v-4.1.01

This change adds support for parsing version ID
in v-xx.xx.xx format

Signed-off-by: John Wang <wangzqbj@inspur.com>
Change-Id: I1a7dd04256d1901e3dafef14baf338b853e2ff97
diff --git a/msl_verify.cpp b/msl_verify.cpp
index 1d93613..b49b079 100644
--- a/msl_verify.cpp
+++ b/msl_verify.cpp
@@ -57,13 +57,13 @@
     std::smatch match;
     version = {0, 0, 0};
 
-    // Match for vX.Y.Z
-    std::regex regex{"v([0-9]+)\\.([0-9]+)\\.([0-9]+)", std::regex::extended};
+    // Match for vX.Y.Z or v-X.Y.Z
+    std::regex regex{"v-?([0-9]+)\\.([0-9]+)\\.([0-9]+)", std::regex::extended};
 
     if (!std::regex_search(versionStr, match, regex))
     {
-        // Match for vX.Y
-        std::regex regexShort{"v([0-9]+)\\.([0-9]+)", std::regex::extended};
+        // Match for vX.Y or v-X.Y
+        std::regex regexShort{"v-?([0-9]+)\\.([0-9]+)", std::regex::extended};
         if (!std::regex_search(versionStr, match, regexShort))
         {
             log<level::ERR>("Unable to parse PNOR version",