Move nfs mount from image build to test phase

The knightly build occasionally failed to boot up the instance. #101 #97

Further investigation shows it might be because the network was not yet available when the instance tries to mount NFS devices.

Two options:

• Don't edit fstab in build phase, and mount the nfs in test phase
• Or, try autofs

added Backlog label

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assigned to @louistw

added Sprint 24-4 label

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added Sprint 24-5 label and removed Sprint 24-4 label

mentioned in merge request !80 (merged)

mentioned in commit f71716da

closed with merge request !80 (merged)

We don't really need to access nfs during boot time. We want to mount nfs after the network is available.

One solution is to move the nfs mount definition out of fstab and mount them with mount command after the instance is completely up and running. Putting the command in user_data could potentially solve the issue.

Another solution is using automounter like autofs. We have autofs definition ready at build time. Because we are not accessing the folder during boot time it won't stop the booting process even if the network is not available at the beginning.

In the !80 (merged), we try with the latter option.