Fix issue that retry interval configuration doesn't work for single dc

On carrier network which allows single data(APN) connection only,
carrier specified retry interval doesn't work because current setupData
doesn't take care of retry and always start cleanUpAllConnections
incorrectly.
To fix this issue, skip the cleanup during retrying data setup for same
ApnContext.

Test: Auto - Passed FrameworksTelephonyTests.
Bug: 119240551

Change-Id: I7667677e4c43596dff6fa5b106fd62a8daa142d8