subsequent ray up calls on the same webserver instance don't update the allocation (stack?)

[shadeofblue]

steps to reproduce:

1. define yaml with a total budget of e.g. 5000
2. ray up
3. fails as expected with

node1: Failed to create activity: golem.managers.base.ManagerException: Insufficient funds to make allocation.
Top up your account or release all existing allocations to unlock the funds via `yagna payment release-allocations

4. update the yaml to e.g. 1 (assuming you do have 1 GLM in your wallet)
5. ray up
6. fails unexpectedly with:

node2: Failed to create activity: golem.managers.base.ManagerException: Insufficient funds to make allocation.
Top up your account or release all existing allocations to unlock the funds via `yagna payment release-allocations`

7. DON'T update the yaml ;)
8. stop the server with ray-on-golem stop
9. ray up
10. now it starts correctly

Logfile:

webserver_debug.log.1.log

[mateuszsrebrny]

Uses refactor from #194