Modify build instruction for Java shim to
    reflect publishing shim-client.jar to local Maven repo

    FIX FAB-439

    https://jira.hyperledger.org/browse/FAB-439



Change-Id: I2a2e87cad0fb7bc386f107e75389ffceafe3977c
Signed-off-by: Satheesh Kathamuthu <satheesh.ceg@gmail.com>