Install bc with all distribution

After commit def4c141 the bc is requred for devstack install on minimal
image, commit fbe12f98 fixed the issue with ubuntu, but not with other
distribution.

Adding bc to the files/rpms-suse/general and files/rpms/general.

Change-Id: Ieb2e3e2af454bca03bb3d7565ff731dc357e699f
Merge "Install bc with all distribution"
Merge branch 'master' of github.com:openstack-dev/devstack