Fix port collision between boots and nginx

[gianarb]

I am not sure when it happens, it can be when we removed the NGINX_IP,
or when we checked that every services were using ports OR network_mode
but we exposed nginx and boots over the same port.

This commit fixes that.

[nshalman]

EDITED TO ADD: What follows here appears to be an unrelated issue which is being tracked as #59

Still getting a failure on the latest commit in this branch:

    provisioner: + cd /certs
    provisioner: + '[' '!' -f ca-key.pem ]
    provisioner: + cfssl gencert -initca ca.json
    provisioner: + cfssljson -bare ca
    provisioner: 2021/03/03 16:13:19 [INFO] generating a new CA key and certificate from CSR
    provisioner: 2021/03/03 16:13:19 [INFO] generate received request
    provisioner: 2021/03/03 16:13:19 [INFO] received CSR
    provisioner: 2021/03/03 16:13:19 [INFO] generating key: rsa-2048
    provisioner: 2021/03/03 16:13:19 [INFO] encoded CSR
    provisioner: 2021/03/03 16:13:19 [INFO] signed certificate with serial number 6198577501498366853967432593968947302343768126
    provisioner: + '[' '!' -f
    provisioner:  server.pem ]
    provisioner: + cfssl
    provisioner:  gencert
    provisioner:  '-ca=ca.pem'
    provisioner:  '-ca-key=ca-key.pem'
    provisioner:  '-config=/ca-config.json' '-profile=server' server-csr.json
    provisioner: + cfssljson -bare server
    provisioner: 2021/03/03 16:13:19 [INFO] generate received request
    provisioner: 2021/03/03 16:13:19 [INFO] received CSR
    provisioner: 2021/03/03 16:13:19 [INFO] generating key: rsa-2048
    provisioner: 2021/03/03 16:13:19 [INFO] encoded CSR
    provisioner: 2021/03/03 16:13:19 [INFO] signed certificate with serial number 185473496253083687571958641817618602018650548890
    provisioner: +
    provisioner: cat
    provisioner:  server.pem
    provisioner:  ca.pem
    provisioner: +
    provisioner: cmp
    provisioner:  -s
    provisioner:  bundle.pem.tmp
    provisioner:  bundle.pem
    provisioner: +
    provisioner: mv
    provisioner:  bundle.pem.tmp
    provisioner:  bundle.pem
    provisioner: Error: No such object:
The SSH command responded with a non-zero exit status. Vagrant
assumes that this means the command failed. The output for this command
should be in the log above. Please read the output to determine what
went wrong.

[gianarb]

Ok! I am finally able to reproduce the issue on EquinixMetal Ubuntu 20.04! But it is not related to this PR! Will update the original one #59

[thebsdbox]

Looks good !