Add syndesis-db pqsql service account

[dmvolod]

In case of using OpenShift storage on NFS, it's better to have a separate account for pqsql db storage to give correct rights, i.e. oc add policy add-scc-to-user anyuid -z syndesys-db

[zregvart]

@rhuss @jimmidyson could you take a look at this?