More flaky fixes for cluster setup

[nickva]

Noticed nouveau elixir tests still throw connection refused errors in the finish_cluster setup step. So try to make all the http requests in dev/run use retries. That also helps us DRY out some repeating bits like header auth and json application content type.

We also had an odd import catch error then import again clause. I don't think we intend this to work on python 2 any longer so I cleaned that up as well.

[jaydoane]

Very nice cleanup!

Tested a couple different ways:

❯ dev/run -a adm:pass --with-haproxy --no-eval dev/remsh
[ * ] Setup environment ... ok
[ * ] Ensure CouchDB is built ... ok
[ * ] Ensure Erlang boot script exists ... ok
[ * ] Prepare configuration files ... ok
[ * ] Start node node1 ... ok
[ * ] Start node node2 ... ok
[ * ] Start node node3 ... ok
[ * ] Check node at http:https://127.0.0.1:15984/ ... ok
[ * ] Check node at http:https://127.0.0.1:25984/ ... ok
[ * ] Check node at http:https://127.0.0.1:35984/ ... ok
[ * ] Running cluster setup ... ok
[ * ] Exec command dev/remsh ... Erlang/OTP 25 [erts-13.2.2] [source] [64-bit] [smp:10:10] [ds:10:10:10] [async-threads:1] [jit]

Enabled docsh 0.7.0 from: /Users/jay/repos/docsh/_build/default/lib/docsh
Call h(docsh) for interactive help.

Eshell V13.2.2  (abort with ^G)
([email protected])1>

and

❯ dev/run -a adm:pass --with-haproxy --with-clouseau --clouseau-dir ~/repos/clouseau --no-eval dev/remsh
[ * ] Setup environment ... ok
[ * ] Ensure CouchDB is built ... ok
[ * ] Ensure Erlang boot script exists ... ok
[ * ] Prepare configuration files ... ok
[ * ] Start node node1 ... ok
[ * ] Start node node2 ... ok
[ * ] Start node node3 ... ok
[ * ] Start Clouseau node clouseau1 ... ok
[ * ] Start Clouseau node clouseau2 ... ok
[ * ] Start Clouseau node clouseau3 ... ok
[ * ] Check node at http:https://127.0.0.1:15984/ ... ok
[ * ] Check Clouseau node clouseau1 ... failed: Clouseau is not working
[ * ] Check node at http:https://127.0.0.1:25984/ ... ok
[ * ] Check Clouseau node clouseau2 ... failed: Clouseau is not working
[ * ] Check node at http:https://127.0.0.1:35984/ ... ok
[ * ] Check Clouseau node clouseau3 ... failed: Clouseau is not working
[ * ] Check node at http:https://127.0.0.1:15984/ ... ok
[ * ] Check Clouseau node clouseau1 ... ok
[ * ] Check node at http:https://127.0.0.1:25984/ ... ok
[ * ] Check Clouseau node clouseau2 ... ok
[ * ] Check node at http:https://127.0.0.1:35984/ ... ok
[ * ] Check Clouseau node clouseau3 ... ok
[ * ] Running cluster setup ... ok
[ * ] Exec command dev/remsh ... Erlang/OTP 25 [erts-13.2.2] [source] [64-bit] [smp:10:10] [ds:10:10:10] [async-threads:1] [jit]

Enabled docsh 0.7.0 from: /Users/jay/repos/docsh/_build/default/lib/docsh
Call h(docsh) for interactive help.

Eshell V13.2.2  (abort with ^G)
(search)`ping': net_adm:ping('[email protected]').
([email protected])1> net_adm:ping('[email protected]').
pong