Do a disconnect if ApnContext is ready but retrying or failed.

This change allows enabling of a ready ApnContext to reconnect if the
ApnContext is IDLE, FAILED or RETRYING. Without this change toggling
wifi or otherwise enabling the connection would not cause the connection
to be retried. Instead, toggling airplane mode would be required.

Bug: 8849653
Change-Id: I83f44dbfd412f4b0122a2108e22f36db94c59d18