[WIth specific image id format provisioning is failing]

Closes-Bug: #1360786
Issue:
Puppet manifest doesnt like special characters in its manifests.
As image name is used for the moduled name.

Fix:
Allow alph-numerice with lowercase only for package image id.

Testing:
1) Add package with allowed chars/unallowed chars.
2) Upload package with allowed chars/unallowed chars.

Change-Id: Ibcc75c5f34b6897bf5fdeee5c9a03c48ce500dcd