Deploy paas-billing without locking the database on refresh
Deploy paas-billing without locking the database on refresh

Our existing paas-billing app was causing user issues in that it was
locking the billing-db during it's init phase and on subsequent
refreshes. We have addressed this issue by using temp tables and
swapping them out. this has reduced the locking time down from ~4
minutes to sub 10 seconds.

alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf