Add script for checking reproducible build

Asmund THORSecrequested to merge
asmund/binarycheck into develop

Example output:


    On commit:        e412a88fa9b2caa61e9ba84c1ae13c89ecbc456d
    Using build tag:  mainnet

    Produced the following binaries:

    cb407ddc81811837174426cd66f1350974995a8bd64a1cf08cc069ea172bae66  /usr/bin/thornode

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