[Debugging] fix test "testContractTransaction1"

[bbulgu]

1. testContractTransaction1: After building the docker container and running the simulation using the README provided in the github repo, testcon.sol is compiled into testcon.bin. I simply copied that file into the root directory of the project. Before doing this, testContractTransaction1 was failing because it couldn't find testcon.bin.

The compilation of the testcon.sol takes place in line 12 of the dockerfile

The possible solutions I can think of are:

a) just keep the compiled testcon.bin file in the repo — this is in fact what I pushed to the branch

b) figure out a way to do the compilation in the test itself. https://ethereum.stackexchange.com/questions/16299/compiling-smart-contract-in-java has a solution using processbuilder - 7 lines