Hard coded time print format checks fail when non-default epoch is used

[skliper]

Is your feature request related to a problem? Please describe.
Epoch is configurable:

cFE/cmake/sample_defs/sample_mission_cfg.h

Lines 186 to 190 in 063b4d8

	#define CFE_MISSION_TIME_EPOCH_YEAR 1980
	#define CFE_MISSION_TIME_EPOCH_DAY 1
	#define CFE_MISSION_TIME_EPOCH_HOUR 0
	#define CFE_MISSION_TIME_EPOCH_MINUTE 0
	#define CFE_MISSION_TIME_EPOCH_SECOND 0

Time unit tests hard-code checks that are impacted by epoch configuration, and fail when it's changed (example):

cFE/modules/time/ut-coverage/time_UT.c

Lines 398 to 424 in 063b4d8

	const char * expectedMET = "2013-001-02:03:14.56789";
	const char * expectedTAI = "2013-001-03:03:14.56789";
	const char * expectedUTC = "2013-001-03:02:42.56789";
	const char * expectedSTCF = "1980-001-01:00:00.00000";
	volatile CFE_TIME_ReferenceState_t *RefState;
	UtPrintf("Begin Test Get Time");
	CFE_TIME_Global.LastVersionCounter = 0x1000;
	/* Test successfully retrieving the mission elapsed time */
	UT_InitData();
	UT_SetBSP_Time(seconds, microsecs);
	RefState = CFE_TIME_StartReferenceUpdate();
	RefState->AtToneMET.Seconds = 20; /* 20.00000 */
	RefState->AtToneMET.Subseconds = 0;
	RefState->AtToneSTCF.Seconds = 3600; /* 01:00:00.00000 */
	RefState->AtToneSTCF.Subseconds = 0;
	RefState->AtToneLeapSeconds = 32;
	RefState->AtToneDelay.Seconds = 0; /* 0.00000 */
	RefState->AtToneDelay.Subseconds = 0;
	RefState->AtToneLatch.Seconds = 10; /* 10.00000 */
	RefState->AtToneLatch.Subseconds = 0;
	RefState->ClockSetState = CFE_TIME_SetState_NOT_SET; /* Force invalid time */
	CFE_TIME_FinishReferenceUpdate(RefState);
	CFE_TIME_Print(timeBuf, CFE_TIME_GetMET());
	CFE_UtAssert_STRINGBUF_EQ(timeBuf, sizeof(timeBuf), expectedMET, strlen(expectedMET));

Describe the solution you'd like
Update tests to work with configured epoch. Either adjust for configured epoch or test the actual values (not print time).

Describe alternatives you've considered
None

Additional context
None

Requester Info
Jacob Hageman - NASA/GSFC, @excaliburtb