Fix ssh key error and also remove duplicates

We need specific key ids for keys, and if the key id changes, we need
a way to delete old ones. We also need the file to be writable by at
least the user so that puppet doesn't complain.

Change-Id: I5718b80d844d5f95149d0e23d98960879955c43c
Merge "Fix ssh key error and also remove duplicates"