consul_installation: Fix binary base url for Linux x86

[legal90]

At the moment consul_installation_binary#binary_basename returns an invalid base url if node['kernel']['machine'] is not literally 'i386'.

Reproduced on CentOS 5.11 x86: attribute node['kernel']['machine'] is "i686" there, so the url became the following:

https://releases.hashicorp.com/consul/0.6.4/consul_0.6.4_linux_i686.zip
#403 "Forbidden"

However it should be:

https://releases.hashicorp.com/consul/0.6.4/consul_0.6.4_linux_386.zip

This PR fixes that issue.

[codecov-io]

Current coverage is 69.02%

Merging #310 into master will increase coverage by +19.81% as of 850d71e

@@            master    #310   diff @@
======================================
  Files            7       9     +2
  Stmts          380     381     +1
  Branches         0       0       
  Methods          0       0       
======================================
+ Hit            187     263    +76
  Partial          0       0       
+ Missed         193     118    -75

Review entire Coverage Diff as of 850d71e

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[lock]

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