Adapt logic to use e2e runner's start and stop commands

[sergio-mena]

This takes advantage of cometbft/cometbft#846

Sample output (you can see typical "e2e" logs, mixed with ansible output):

qa-infra % make start-network
go run github.com/cometbft/cometbft/test/e2e/runner@d842aeede start -f ./ansible/testnet.toml --infrastructure-type digital-ocean --infrastructure-data ansible/testnet/infrastructure-data.json
I[2023-05-05|18:19:59.514] Starting initial network nodes...
COMMAND_VERBOSE: [ansible-playbook ansible/testnet/systemd-action.yml -f 50 -u root --inventory 64.226.102.154,165.22.26.15,64.226.102.4,165.22.28.132,]

PLAY [start testapp] ************************************************************************************************************************************************************************************************

TASK [Gathering Facts] **********************************************************************************************************************************************************************************************
ok: [64.226.102.4]
ok: [165.22.26.15]
ok: [64.226.102.154]
ok: [165.22.28.132]

TASK [operate on the systemd-unit] **********************************************************************************************************************************************************************************
changed: [165.22.26.15]
changed: [64.226.102.154]
changed: [64.226.102.4]
changed: [165.22.28.132]

PLAY RECAP **********************************************************************************************************************************************************************************************************
165.22.26.15               : ok=2    changed=1    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0
165.22.28.132              : ok=2    changed=1    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0
64.226.102.154             : ok=2    changed=1    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0
64.226.102.4               : ok=2    changed=1    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0

I[2023-05-05|18:20:05.434] start                                        msg="Node seed01 up on http://64.226.102.154:26657"
I[2023-05-05|18:20:06.223] start                                        msg="Node validator00 up on http://165.22.26.15:26657"
I[2023-05-05|18:20:06.318] start                                        msg="Node validator01 up on http://64.226.102.4:26657"
I[2023-05-05|18:20:06.401] start                                        msg="Node validator02 up on http://165.22.28.132:26657"
I[2023-05-05|18:20:06.401] Waiting for initial height                   height=1 nodes=4 pending=1
I[2023-05-05|18:20:12.603] Waiting for network to advance before starting catch up node node=validator03 height=10
I[2023-05-05|18:20:37.898] Starting catch up node                       node=validator03 height=10
COMMAND_VERBOSE: [ansible-playbook ansible/testnet/systemd-action.yml -f 50 -u root --inventory 64.226.102.166,]

PLAY [start testapp] ************************************************************************************************************************************************************************************************

TASK [Gathering Facts] **********************************************************************************************************************************************************************************************
ok: [64.226.102.166]

TASK [operate on the systemd-unit] **********************************************************************************************************************************************************************************
changed: [64.226.102.166]

PLAY RECAP **********************************************************************************************************************************************************************************************************
64.226.102.166             : ok=2    changed=1    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0

I[2023-05-05|18:20:45.061] start                                        msg="Node validator03 up on http://64.226.102.166:26657 at height 12"
qa-infra %

[hvanz]

LGTM