Fix character limit of build_image.py and test_build_image.py

This Adds a new line break for every lines that exceeds character limit.

Tested: Unit tests all passed. End-to-end test with sstate-cache passed.

Signed-off-by: Simon-Lii <thesimonli@google.com>
Change-Id: I721165dd54b733130c53c2f28db09f2bf4f79143

steps/build_image.py

diff --git a/steps/build_image.py b/steps/build_image.py
index 869a3be..079a5f4 100644
--- a/steps/build_image.py
+++ b/steps/build_image.py
@@ -16,15 +16,16 @@
 
     def export_bb_env_passthrough_additions(self):
         """Adds GBMC_CONFIG and GBMC_VERSION to BB_ENV_PASSTHROUGH_ADDITIONS whitelist"""
-        return "export BB_ENV_PASSTHROUGH_ADDITIONS=${BB_ENV_PASSTHROUGH_ADDITIONS} GBMC_CONFIG GBMC_VERSION"
+        return "export BB_ENV_PASSTHROUGH_ADDITIONS=${BB_ENV_PASSTHROUGH_ADDITIONS} " \
+               "GBMC_CONFIG GBMC_VERSION"
 
     def run_script(self):
 
         # command =
         # """export MACHINE=machine0 && source setup machine0 && umask 002
         # && export GBMC_CONFIG=dev && export GBMC_VERSION=x.y.z
-        # && export BB_ENV_PASSTHROUGH_ADDITIONS=${BB_ENV_PASSTHROUGH_ADDITIONS} GBMC_CONFIG GBMC_VERSION
-        # && bitbake -k obmc-phosphor-image
+        # && export BB_ENV_PASSTHROUGH_ADDITIONS=${BB_ENV_PASSTHROUGH_ADDITIONS}
+        # GBMC_CONFIG GBMC_VERSION && bitbake -k obmc-phosphor-image
         # """
         command = " && ".join([
             self.export_machine(), self.source_setup(), self.umask(), self.export_gbmc_config(),

unit_tests/test_build_image.py

diff --git a/unit_tests/test_build_image.py b/unit_tests/test_build_image.py
index 2b7535d..c6c69cc 100644
--- a/unit_tests/test_build_image.py
+++ b/unit_tests/test_build_image.py
@@ -63,7 +63,8 @@
                     "&& umask 002 " \
                     "&& export GBMC_CONFIG=test " \
                     "&& export GBMC_VERSION=x.y.z " \
-                    "&& export BB_ENV_PASSTHROUGH_ADDITIONS=${BB_ENV_PASSTHROUGH_ADDITIONS} GBMC_CONFIG GBMC_VERSION " \
+                    "&& export BB_ENV_PASSTHROUGH_ADDITIONS=$" \
+                    "{BB_ENV_PASSTHROUGH_ADDITIONS} GBMC_CONFIG GBMC_VERSION " \
                     "&& bitbake -k obmc-phosphor-image"
 
         subprocess.run.assert_called_with(["bash", "-c", command])