Increased instance boot wait time to 60 seconds.

Doesn't add any time to total, since an instance that boots in less
than 60 seconds is already working on cloud_init phase by the time
we check again.
Handle upstream changes to Oracle's download site.

Use patched OAB from ladios/oab-java6 to resolve upstream changes
to Oracle's java download site.

See https://github.com/flexiondotorg/oab-java6/pull/125

Fixes #16.