Trim master password when someone uses strange XML formatting (#82)

Fixes #80

Author: cstamas

src/main/java/org/codehaus/plexus/components/secdispatcher/internal/dispatchers/LegacyDispatcher.java

@@ -152,9 +152,13 @@ private String getMasterMasterPasswordFromSettingsSecurityXml() {
         }
         if (Files.exists(xml)) {
             try (InputStream is = Files.newInputStream(xml)) {
-                return (String) XPathFactory.newInstance()
+                String result = (String) XPathFactory.newInstance()
                         .newXPath()
                         .evaluate("//master", new InputSource(is), XPathConstants.STRING);
+                if (result != null) {
+                    result = result.trim();
+                }
+                return result;
             } catch (Exception e) {
                 // just ignore whatever it is
             }

src/test/legacy/legacy-settings-security-2.xml

@@ -1,4 +1,6 @@
 <settingsSecurity>
     <relocation>to the moon</relocation>
-    <master>{KDvsYOFLlXgH4LU8tvpzAGg5otiosZXvfdQq0yO86LU=}</master>
+    <master>
+        {KDvsYOFLlXgH4LU8tvpzAGg5otiosZXvfdQq0yO86LU=}
+    </master>
 </settingsSecurity>