Completed 100% coverage on cfe_es_start.c

Static Analysis Warning - Infinite loop false alarm in unit test

Test the following cases:
- CFE_ES_TaskMain() with a CFE_ES_TaskInit() error
- Query tasks command with valid lib ID
- Error when sending Build Info event
- CFE_ES_GenerateVersionEvents() error when sending mission event
- Loop coverage for CFE_ES_FindConfigKeyValue()

Fix #1184, Change index type to resolve infinite loop warning

Fix #468, Adding coverage for cfe_es_task.c

…ional_tests

Fix #1480, Expand FS Header Functional tests.

Fix #467, #1636 Complete coverage for cfe_es_start.c and cfe_es_syslog.c