fix bug when admin token is invalid; the solution is create new token;
add unit test;
Merge pull request #32 from jesuspg/bug/28_restart_keystone

Error authenticating after restart keystone
Merge branch 'develop' of https://github.com/telefonicaid/fiware-paas into issues/introductionoffederatednetworks_20

Conflicts:
	rest-api/src/main/java/com/telefonica/euro_iaas/paasmanager/rest/auth/OpenStackAuthenticationProvider.java