MB-12643:bp:MB-12156 Don't trap exits while change disk paths.

It's not needed and prevents us from a situation where process gets
stuck and wakes up much later (potentially after node became part of a
cluster) and thus invalidates the check that node is not provisioned.

Change-Id: Ic0d5b9a05088b0d376002338109d80cabc44f0ed
Orig-Reviewed-on: http://review.couchbase.org/41333
Reviewed-on: http://review.couchbase.org/43230
Reviewed-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>