IC:2021-08-31, cFE, osal, cFS-GroundSystem

**Combines**

nasa/cFE#1885,              v6.8.0-rc1+dev980
nasa/osal#1138,             v5.1.0-rc1+dev598
nasa/cFS-GroundSystem#195,  v2.2.0-rc1+dev63

**Includes**

*cFE*

nasa/cFE#1870, Add SB API test cases
nasa/cFE#1869, Add ES API test cases
nasa/cFE#1872, Add TBL API test cases
nasa/cFE#1871, Add FS API test cases
nasa/cFE#1860, Add Time Clock Test
nasa/cFE#1862, EVS coverage test
nasa/cFE#1876, SB test improvements
nasa/cFE#1865, CFE_TBL_Modified: Test CRC, updated flag
nasa/cFE#1881, Improve EVS code coverage
nasa/cFE#1877, add call to CFE_ES_ExitChildTask
nasa/cFE#1902, Incorrect OSAL Format in Users Guide Reference
nasa/cFE#1884, Improve FS coverage
nasa/cFE, Improve MSG branch coverage
nasa/cFE#1891, Improve resource ID branch coverage
nasa/cFE#1894, Improve SBR branch coverage
nasa/cFE#1896, Fix #1895, Improve TIME branch coverage
nasa/cFE#1904, Improve TBL code coverage
nasa/cFE#1864, Support custom PSP directory
nasa/cFE#1913, Update time tests to use bitmask check macros
nasa/cFE#1923, remove extra word in comment

*osal*

nasa/osal#1136, add bitmask assert macros

*cFS-GroundSystem*

nasa/cFS-GroundSystem#190, Fix #189, Virtualenv and Pipenv .gitignore support
nasa/cFS-GroundSystem#194, Fix doc, comment, and message typos

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: Ariel Adams             <ArielSAdamsNASA@users.noreply.github.com>
Co-authored-by: Jose F Martinez Pedraza <pepepr08@users.noreply.github.com>
Co-authored-by: Avi                     <thnkslprpt@users.noreply.github.com>
Co-authored-by: Paul                    <pavll@users.noreply.github.com>