camput: remove Go 1.0 workaround.

Now that we rely on Go 1.1, we no longer need to workaround https://code.google.com/p/go/issues/detail?id=4589

Change-Id: Ib6631679e7f9bcea82ef96df0f50d9ecace31aa3
On Linux, don't assume fusermount is in /bin. Use PATH.

Change-Id: If6c59a3776dcc679e9fabaa989e35c8be38baa00
osutil: simplify GoPackagePath

Change-Id: If0af2e19c56d495ff46dc38a19b5148fa9f014fe
encrypt: start of index recovery/compaction from meta blobs on start-up

Change-Id: I8aae66194ee67b1d63704ff98868e02f8b943e17