IC:2021-07-20, Update cfe and osal

**Combines**

nasa/cFE#1665, v6.8.0-rc1+dev762
nasa/osal#1113, v5.1.0-rc1+dev573

**Includes**

nasa/cFE#1664, remove default .dat extension
nasa/cFE#1660, Change CI to use Test Log.
nasa/cFE#1670, Update API doxygen list
nasa/cFE#1671, update documentation for CFE_ES_GetPoolBufInfo
nasa/cFE#1674, CFE_SB_MsgHdrSize returns size_t
nasa/cFE#1668, improve SB coverage test
nasa/cFE#1694, correct function name in UT_BSP_Unlock

nasa/osal#1106, Add independent OS_rename functional test parameter checks

Co-authored-by: Jacob Hageman <skliper@users.noreply.github.com>
Co-authored-by: Joseph Hickey <jphickey@users.noreply.github.com>
Co-authored-by: Alex Campbell <zanzaben@users.noreply.github.com>
Co-authored-by: Oliver Hamburger <oliverhamburger@users.noreply.github.com>