New instantiates an etcd kv implementation. The parameter addr may be the empty
string or a valid URL. If addr is not empty it must be a valid URL with schemes
http, https or etcd; etcd is synonymous with http. If addr is the empty string
the etcd client will connect to the default address.
New instantiates an etcd kv implementation.
The parameter addr may be the empty string or a valid URL.
If addr is not empty it must be a valid URL with schemes http, https or etcd; etcd is synonymous with http.
If addr is the empty string the etcd client will connect to the default address.