Expand matching of requirements.txt file to include any prefixes or suffixes (#168)

* Expand matching of requirements.txt file to include any prefixes or suffixes

Signed-off-by: Samuel Dacanay <sam.dacanay@anchore.com>

* Add some test cases to integration test (ensure syft can pick up multiple requirements files)

Signed-off-by: Samuel Dacanay <sam.dacanay@anchore.com>

* Run lint-fix

Signed-off-by: Samuel Dacanay <sam.dacanay@anchore.com>

test/integration/pkg_cases.go

@@ -81,7 +81,13 @@ var cases = []struct {
 		pkgType:     pkg.PythonRequirementsPkg,
 		pkgLanguage: pkg.Python,
 		pkgInfo: map[string]string{
-			"flask": "4.0.0",
+			"flask":              "4.0.0",
+			"python-dateutil":    "2.8.1",
+			"python-swiftclient": "3.8.1",
+			"pytz":               "2019.3",
+			"jsonschema":         "2.6.0",
+			"passlib":            "1.7.2",
+			"pathlib":            "1.0.1",
 		},
 	},
 	{

test/integration/test-fixtures/image-pkg-coverage/python/requires/requirements-dev.txt

@@ -0,0 +1,3 @@
+jsonschema==2.6.0
+passlib==1.7.2
+pathlib==1.0.1

test/integration/test-fixtures/image-pkg-coverage/python/requires/test-requirements.txt

@@ -0,0 +1,3 @@
+python-dateutil==2.8.1
+python-swiftclient==3.8.1
+pytz==2019.3