packer: increase pause_before value and add ssh_read_write_timeout

[benipeled]

After adding the pause_before param on db75e41 I saw that we have SSH connection issues, so in this PR I'm increasing the pause to 20s and adding the ssh_read_write_timeout param

Example failure:

10:08:16  �[1;32m==> aws: Pausing 10s before the next provisioner...�[0m
10:08:27  �[1;32m==> aws: Uploading files/ => /home/ubuntu/�[0m
10:08:30  �[1;31m==> aws: Upload failed: dial tcp 54.198.229.78:22: connect: connection refused�[0m
10:08:30  �[1;32m==> aws: Provisioning step had errors: Running the cleanup provisioner, if present...�[0m
10:08:30  �[1;32m==> aws: Terminating the source AWS instance...�[0m
10:09:36  �[1;32m==> aws: Cleaning up any extra volumes...�[0m
10:09:36  �[1;32m==> aws: No volumes to clean up, skipping�[0m
10:09:36  �[1;32m==> aws: Deleting temporary keypair...�[0m
10:09:36  �[1;31mBuild 'aws' errored after 2 minutes 23 seconds: dial tcp 54.198.229.78:22: connect: connection refused�[0m
10:09:36  
10:09:36  ==> Wait completed after 2 minutes 23 seconds
10:09:36  
10:09:36  ==> Some builds didn't complete successfully and had errors:
10:09:36  --> aws: dial tcp 54.198.229.78:22: connect: connection refused
10:09:36  
10:09:36  ==> Builds finished but no artifacts were created.

[benipeled]

Verified twice

• https://jenkins.scylladb.com/job/scylla-master/job/releng-testing/job/next-machine-image/142/
• https://jenkins.scylladb.com/job/scylla-master/job/releng-testing/job/next-machine-image/143/

12:37:42  �[1;32m==> gce: Pausing 20s before the next provisioner...�[0m
12:38:02  �[1;32m==> gce: Uploading files/ => /home/ubuntu/�[0m
12:38:02  �[1;32m==> gce: Uploading scylla_install_image => /home/ubuntu/�[0m
12:38:03  �[1;32m==> gce: Provisioning with shell script: /tmp/packer-shell1237633713�[0m
12:38:04  �[0;32m    gce:�[0m
12:38:04  �[0;32m    gce: status: done�[0m

12:40:30  �[1;32m==> azure: Pausing 20s before the next provisioner...�[0m
12:40:42  �[1;32m==> azure: Uploading files/ => /home/azureuser/�[0m
12:40:42  �[1;32m==> azure: Uploading scylla_install_image => /home/azureuser/�[0m
12:40:42  �[1;32m==> azure: Provisioning with shell script: /tmp/packer-shell235878628�[0m
12:40:43  �[0;32m    azure:�[0m
12:40:43  �[0;32m    azure: status: done�[0m

12:39:09  �[1;32m==> aws: Pausing 20s before the next provisioner...�[0m
12:39:26  �[1;32m==> aws: Uploading files/ => /home/ubuntu/�[0m
12:39:26  �[1;32m==> aws: Uploading scylla_install_image => /home/ubuntu/�[0m
12:39:27  �[1;32m==> aws: Provisioning with shell script: /tmp/packer-shell2228372284�[0m
12:39:28  �[0;32m    aws:�[0m
12:39:28  �[0;32m    aws: status: done�[0m

[Annamikhlin]

why "ssh_timeout" for gce only set to "6m"? Is there any reason?

[benipeled]

no idea probably to increase the default

[Annamikhlin]

Seems that the default for ssh_timeout is 5m (accoding to the doc), do we really need to add it?

[benipeled]

To align with other providers
You're right we can remove it from all (if 5m is enough) - on the next change