fix: results of pip show are not properly parsed (#70)

## Description

Splitting `pip show` results with `---` could generate incorrect results
when a package contains license information.
An example of such package can be generated by executing `pip3 show
scipy`.

Code in this PR reads the results of `pip show` line by line, and groups
information by packages.

Jira: https://issues.redhat.com/browse/TC-644

## Checklist

- [x] I have followed this repository's contributing guidelines.
- [x] I will adhere to the project's code of conduct.

## Additional information

> Anything else?

src/main/java/com/redhat/exhort/utils/PythonControllerBase.java

@@ -204,7 +204,7 @@ private List<Map<String, Object>> getDependenciesImpl(String pathToRequirements,
     String[] deps = freeze.split(System.lineSeparator());
     String depNames = Arrays.stream(deps).map(PythonControllerBase::getDependencyName).collect(Collectors.joining(" "));
     String pipShowOutput = Operations.runProcessGetOutput(pythonEnvironmentDir, pipBinaryLocation, "show", depNames);
-    List<String> allPipShowLines = Arrays.stream(pipShowOutput.split("---")).collect(Collectors.toList());
+    List<String> allPipShowLines = splitPipShowLines(pipShowOutput);
     Map<StringInsensitive,String> CachedTree = new HashMap<>();
     List<String> linesOfRequirements;
     try {
@@ -312,4 +312,8 @@ private  static int getFirstSign(int rightTriangleBracket, int leftTriangleBrack
         equalsSign = equalsSign == -1 ? 999 : equalsSign;
         return equalsSign < leftTriangleBracket && equalsSign < rightTriangleBracket ? equalsSign : (leftTriangleBracket < equalsSign && leftTriangleBracket < rightTriangleBracket ? leftTriangleBracket : rightTriangleBracket);
   }
+
+  static List<String> splitPipShowLines(String pipShowOutput) {
+    return Arrays.stream(pipShowOutput.split(System.lineSeparator() + "---" + System.lineSeparator())).collect(Collectors.toList());
+  }
 }