def mount_tune(path, data = {})
      json = client.post("/v1/sys/mounts/#{encode_path(path)}/tune", JSON.fast_generate(data))
      return true
    end
def mount_tune(path, data = {})
      json = client.post("/v1/sys/mounts/#{encode_path(path)}/tune", JSON.fast_generate(data))
      return true
    end
Tune a mount at the given path.

 @example
   Vault.sys.mount_tune("pki", max_lease_ttl: '87600h') #=> true

 @param [String] path
   the path to write
 @param [Hash] data
   the data to write