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This patch adds stubs for the UpdateTimeToLive and DescribeTimeToLive operations to Alternator. These operations can enable, disable, or inquire about, the chosen expiration-time attribute. Currently, the information about the chosen attribute is only saved, with no actual expiration of any items taking place. Some of the tests for the TTL feature start to pass, so their xfail tag is removed. Because this this new feature is incomplete, it is not enabled unless the "alternator-ttl" experimental feature is enabled. Moreover, for these operations to be allowed, the entire cluster needs to support this experimental feature, because all nodes need to participate in the data expiration - if some old nodes don't support Alternator TTL, some of the data they hold won't get expired... So we don't allow enabling TTL until all the nodes in the cluster support this feature. The implementation is in a new source file, alternator/ttl.cc. This source file will continue to grow as we implement the expiration feature. Signed-off-by: Nadav Har'El <nyh@scylladb.com>