Describe the contribution
Fix #23

Adds a call to the SAMPLE_Function() provided by sample_lib as part of the example command processing.

This is to demonstrate two things:

• For FSW, it shows that runtime linking is working as expected, not just for functions provided in the core/base (e.g. CFE,OSAL,PSP) but also for dynamically loaded libraries
• For unit test, it provides a use-case for linking with stubs provided by an external library

Testing performed
Build with ENABLE_UNIT_TESTS=TRUE, both with SIMULATION=native and for a 32-bit raspberry pi target.
Execute CFE code, and confirm that everything starts normally. SAMPLE_LIB is loaded first, and SAMPLE_APP is loaded next and no runtime linking issues are reported.

Log snippet:

1980-012-14:03:20.25133 ES Startup: Loading shared library: /cf/sample_lib.so
SAMPLE Lib Initialized.  Version 1.1.0.0
1980-012-14:03:20.25164 ES Startup: Loading file: /cf/sample_app.so, APP: SAMPLE_APP
1980-012-14:03:20.25176 ES Startup: SAMPLE_APP loaded and created
EVS Port1 42/1/SAMPLE_APP 1: SAMPLE App Initialized. Version 1.1.1.0

Send the "PROCESS_CC` command and confirm that the function is invoked from SAMPLE_LIB:

1980-012-14:03:22.10319 Sample App: Table Value 1: 1  Value 2: 2
1980-012-14:03:22.10321 Sample App: CRC: 0xFFFF9C00
SAMPLE_Function called, buffer='SAMPLE DATA'

Expected behavior changes
The PROCESS_CC command now makes a call into the sample library.

System(s) tested on:
Ubuntu 18.04 LTS 64-bit

Contributor Info
Joseph Hickey, Vantage Systems, Inc.

Community contributors
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