Fix DefaultEurekaClientConfig units

EurekaServiceUrlPollInterval is named
getEurekaServiceUrlPollIntervalSeconds in EurekaClientConfig interface
but serviceUrlPollIntervalMs in config files. Its default looks
suspiciously like it shouldn't be multiplied by 1000. This config is
actually used as seconds. Changed to be seconds
serviceUrlPollIntervalSeconds and fixed the default.

EurekaServerReadTimeoutSeconds and EurekaServerConnectTimeoutSeconds
were both being contributed as millseconds and used as milliseconds.
Changed to seconds in config files and use of the config changed to use
seconds.