Feat/change prefixes 256

[shannonwells]

problem

We shouldn't be specifying the root namespace, rather give it a prefix only and allow nodes to add their own, otherwise attach to root.
Part of #256

solution

delete text specifying base namespace

[codecov-io]

Codecov Report

Merging #257 into master will increase coverage by 0.07%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #257      +/-   ##
==========================================
+ Coverage   64.91%   64.97%   +0.07%     
==========================================
  Files          39       39              
  Lines        2288     2272      -16     
==========================================
- Hits         1485     1476       -9     
+ Misses        685      680       -5     
+ Partials      118      116       -2     

Impacted Files	Coverage Δ
piecestore/piecestore.go	82.76% <ø> (ø)
retrievalmarket/impl/client.go	67.89% <ø> (ø)
retrievalmarket/impl/provider.go	70.91% <ø> (ø)
storagemarket/impl/provider.go	5.56% <ø> (ø)
retrievalmarket/discovery/local.go	60.98% <100.00%> (ø)
retrievalmarket/impl/blockio/traverser.go	72.23% <0.00%> (+3.34%)	⬆️
filestore/file.go	100.00% <0.00%> (+23.53%)	⬆️

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[hannahhoward]

Sorry small changes requested -- unless there are multiple keys needed there should be no namespace wrap at all.