This commit fix the deploy precheck <release> command output which
is returning one line with an blank "Error:" when the output is correct.
Test Plan:
PASS: Deploy precheck <release> returning without error.
PASS: Deploy precheck <release> returning expected error.
PASS: Deploy start failed with expected error.
PASS: Deploy start
Note: Exit code 3 was chosen based on exit codes with special meaning
which the 1 is for catchall general errors and 2 for misuse of shell
builtins. The number 3 is not allocated with special meaning so it
was chosen for unhealthy precheck.
Closes-Bug: 2056106
Change-Id: Ifed48157f7810eec2881d8a9e011eae8941f3427
Signed-off-by: Luis Eduardo Bonatti <LuizEduardo.Bonatti@windriver.com>