Making and mounting a file system from cfe functional caused a reformat of RAM on MCP750

[skliper]

Describe the bug
See #1963. Note #1964 worked around the issue by just using existing ram, but OS_mkfs/OS_mount should have no impact on the existing drive(s).

To Reproduce
Run the old FS test that creates the additional mount and observe the reformat on MCP750.

cFE/modules/cfe_testcase/src/fs_header_test.c

Lines 36 to 46 in 64a6a59

	#define OS_TEST_HEADER_FILENAME "/drive0/header_test.txt"
	char *fsAddrPtr = NULL;
	static osal_id_t setup_file(void)
	{
	osal_id_t id;
	OS_mkfs(fsAddrPtr, "/ramdev1", "RAM", 512, 20);
	OS_mount("/ramdev1", "/drive0");
	UtAssert_INT32_EQ(OS_OpenCreate(&id, OS_TEST_HEADER_FILENAME, OS_FILE_FLAG_CREATE, OS_READ_WRITE), OS_SUCCESS);
	return id;
	}

Expected behavior
Shouldn't cause a reformat...

System observed on:

• Hardware: MCP750
• OS: VxWorks 6.9
• Versions: Bundle main (pre Fix #1963, Use existing /ram for FS header test #1964 merge)

Additional context
None

Reporter Info
Jacob Hageman - NASA/GSFC