The api module previously had defaultPartition and defaultNamespace vars
for when we need default/empty split usage between ent/oss respectively.
This commit moves those two variables out of test code so that they can
be used for the service exports config entry's `GetNamespace()` method.
Previously `GetNamespace()` would return "default" in both OSS and enterprise,
which can trip up automation that passes the result of this method as the
namespace to write a config entry.
The split vars are kept private to prevent external usage, and prefixed with
`split` for more clarity about their behavior.
* Use consts for well known tagged adress keys
* Add ipv4 and ipv6 tagged addresses for node lan and wan
* Add ipv4 and ipv6 tagged addresses for service lan and wan
* Use IPv4 and IPv6 address in DNS
* Retry the creation of the test server three times.
* Reduce the retry timeout for the API wait to 2 seconds, opting to fail faster and start over.
* Remove wait for leader from server creation. This wait can be added on a test by test basis now that the function is being exported.
* Remove wait for anti-entropy sync. This is built into the existing WaitForSerfCheck func, so that can be used if the anti-entropy wait is needed