Run cargo clean before executing the test suite

It looks like cargo build caused some issues where some of the crates need to be recompiled.

Author: sorpaas

test.sh

@@ -57,4 +57,5 @@ cd parity-clib-example && \
 # Running tests
 echo "________Running Parity Full Test Suite________"
 git submodule update --init --recursive
+cargo clean
 cargo test -j 8 $OPTIONS --features "$FEATURES" --all $1