User can not use '.' for VDB name in order to version the VDB

User can not use '.' for VDB name.
According to the Official document[1], user should be able to use '.' to specify the version for VDB.

[1]Administration_and_Configuration_Guide:11.2. Set the VDB Version
https://access.redhat.com/site/documentation/en-US/Red_Hat_JBoss_Data_Virtualization/6/html/Administration_and_Configuration_Guide/chap-Versioning.html#Set_the_VDB_Version1
Version-Release number of selected component (if applicable):

Steps to Reproduce:
1. Create a new VDB named "test1.1"

Actual results:
The version attribute from the vdb.xml is used instead.

Expected results:
User can use '.' for VDB name.