consolidate locking into Call method

lock on individual addresses
disable submit button when waiting for server response
Merge pull request #1300 from control-center/feature/modalSubmitLoad

disable submit button when waiting for server response
Set up a reverse proxy for the docker registry
Merge pull request #1299 from control-center/feature/rpc_locks

Feature/rpc locks
Merge pull request #1302 from control-center/feature/cc-446

Set up a reverse proxy for the docker registry
make the health check wider for double digit instances
Merge pull request #1304 from control-center/feature/CC-465

make the health check wider for double digit instances
Merge branch 'develop' into fix/CC-442