sosreport: Accept commas, period and alphas in the case id

sosreport does not accept commas, period and alphas in the case
id, the patch fixes the same.

Change the ticket number field to case id as it now accepts
alpha numerals as well but maintain the '--ticket-number' option
for compatibility.

Signed-off-by: Aruna Balakrishnaiah <aruna@linux.vnet.ibm.com>
Signed-off-by: Bryn M. Reeves <bmr@redhat.com>