Start portal mariadb db docker with non root user

Modification to Dockerfile to start maria-db docker as
a non root user. Leveraged user 'mysql' already created
by the mariaDB image

Issue-ID: PORTAL-966
Signed-off-by: SandeepLinux <Sandeep.Shah@att.com>
Change-Id: I79c9bc00778a562b5b53265933ee8c19e45d9055
1 file changed