remove 8888 port in sample_data.sh

Swift now doesn't use 8888 port as any default service. And the origin
sample_data.sh always let new users to fail and modify swift bind port.
So switching 8888 port here to 8080 could generate sample data without
any change for building swift + keystone environment.

Closes-Bug: #1244304
Change-Id: If58f9f025f57565733aa25efc2fdf06865781391
Merge "remove 8888 port in sample_data.sh"