Changes:
*Added request authentication incoming from Http cloud task
based on token verification
*Updated core-lib-gcp version in pom
*Added property with service acc mail, for token validation
*Updated google-cloud-datastore lib version , to reuse it's Oauth2 dependencies

Riabokon Stanislav(EPAM)[GCP] authored 4 years ago and Rostislav Dublin (EPAM) committed 4 years ago

Moved credentials classes into core-lib-gcp.

Updated README.md
Added a flag 'security.https.certificate.trust' with default value 'false'