Replace error variable names in test suite with enum error codes

tests/bugfixes/github/test_CVE_2017_1000127.py

@@ -11,6 +11,6 @@ class TestPoC(system_tests.Case):
     commands = ["{exiv2} " + filename]
     stdout = [""]
     stderr = ["""{exiv2_exception_msg} """ + filename + """:
-{error_57_message}
+{kerInvalidMalloc}
 """]
     retval = [1]

tests/bugfixes/github/test_CVE_2017_14680.py

@@ -12,6 +12,6 @@ class CVE_2017_14680(system_tests.Case):
     commands = ["{exiv2} " + filename]
     stdout = [""]
     stderr = ["""{exiv2_exception_msg} """ + filename + """:
-{error_58_message}
+{kerCorruptedMetadata}
 """]
     retval = [1]

tests/bugfixes/github/test_CVE_2017_14857.py

@@ -11,5 +11,5 @@ class CVE_2017_14857(system_tests.Case):
     stdout = [""]
     stderr = [
         """{exiv2_exception_msg} """ + filename + """:
-{error_57_message}
+{kerInvalidMalloc}
 """]

tests/bugfixes/github/test_CVE_2017_17669.py

@@ -11,6 +11,6 @@ class RunPocFile(system_tests.Case):
     stdout = [""]
     stderr = [
 	"""{exiv2_exception_msg} """ + filename + """:
-{error_14_message}
+{kerFailedToReadImageData}
 """
     ]

tests/bugfixes/github/test_CVE_2018_4868.py

@@ -13,6 +13,6 @@ class TestCvePoC(system_tests.Case):
     commands = ["{exiv2} " + filename]
     stdout = [""]
     stderr = ["""{exiv2_exception_msg} """ + filename + """:
-{error_58_message}
+{kerCorruptedMetadata}
 """]
     retval = [1]

tests/bugfixes/github/test_issue_208.py

@@ -11,6 +11,5 @@ class CVE_2017_14857(system_tests.Case):
     stdout = [""]
     stderr = [
         """{exiv2_exception_msg} """ + filename + """:
-{error_58_message}
+{kerCorruptedMetadata}
 """]
-

tests/suite.conf

@@ -15,7 +15,7 @@ data_path: ../test/data
 tiff-test: ${ENV:exiv2_path}/tiff-test${ENV:binary_extension}
 
 [variables]
-error_14_message: Failed to read image data
-error_58_message: corrupted image metadata
-error_57_message: invalid memory allocation request
+kerFailedToReadImageData: Failed to read image data
+kerCorruptedMetadata: corrupted image metadata
+kerInvalidMalloc: invalid memory allocation request
 exiv2_exception_msg: Exiv2 exception in print action for file