GUACAMOLE-2139: Migrate all license information to new automated format.

doc/licenses/guava/LICENSE

@@ -0,0 +1,4 @@
+# Name:    Guava: Google Core Libraries for Java
+# URL:     https://github.com/google/guava
+# From:    'Google Inc.' (http://www.google.com/)
+# License: Apache v2.0

doc/licenses/guava/dep-coordinates.txt

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+com.google.guava:failureaccess:jar:*
+com.google.guava:guava:jar:*
+com.google.guava:listenablefuture:jar:*