Bump JDK versionr to 8u181
Bump JDK versionr to 8u181

Due to upstream update (removing version 8u171 from download servers),
oracle-java8-installer become corrupted.

Hack download link and version number inside it, to point it to version
8u181.

jonvestal/open-kilda,jonvestal/open-kilda,telstra/open-kilda,telstra/open-kilda,telstra/open-kilda,telstra/open-kilda,telstra/open-kilda,jonvestal/open-kilda,jonvestal/open-kilda,telstra/open-kilda,jonvestal/open-kilda,telstra/open-kilda