Configure rules for Rubocop

After removing the gem 'scc-codestyle' (outdated version), Rubocop's
default configuration caused a lot of warnings/errors when linting the
project.

This commit adds rules to 'rubocop.yml' so that the current code passes
the linting process in the CI. Though I agree some of the rules are
important to keep a good style for the project, the idea is just to
adjust our CI process for Tumbleweed at the moment.

.rubocop.yml

@@ -11,6 +11,105 @@ AllCops:
     - package/*
     - Rakefile
 
+Layout/EmptyLineAfterGuardClause:
+  Enabled: false
+
+Layout/EmptyLinesAroundMethodBody:
+  Enabled: false
+
+Layout/EmptyLines:
+  Enabled: false
+
+Layout/HashAlignment:
+  Enabled: false
+
+Layout/LineLength:
+  Enabled: true
+  Max: 160
+
+Lint/ErbNewArguments:
+  Enabled: false
+
+Lint/MissingSuper:
+  Enabled: false
+
+Lint/MixedRegexpCaptureTypes:
+  Enabled: false
+
+Metrics/AbcSize:
+  Enabled: true
+  Max: 80
+
+Metrics/BlockLength:
+  Enabled: false
+
+Metrics/ClassLength:
+  Enabled: true
+  Max: 160
+
+Metrics/MethodLength:
+  Enabled: true
+  Max: 50
+
+Metrics/PerceivedComplexity:
+  Enabled: true
+  Max: 12
+
+Naming/MethodParameterName:
+  Enabled: false
+
+Naming/VariableNumber:
+  Enabled: false
+
+Style/ClassAndModuleChildren:
+  Enabled: false
+
+Style/ClassEqualityComparison:
+  Enabled: false
+
+Style/Documentation:
+  Enabled: false
+
+Style/ExpandPathArguments:
+  Enabled: false
+
+Style/FormatString:
+  Enabled: false
+
+Style/FrozenStringLiteralComment:
+  Enabled: false
+
+Style/HashTransformValues:
+  Enabled: false
+
+Style/NumericPredicate:
+  Enabled: false
+
+Style/ParenthesesAroundCondition:
+  Enabled: false
+
+Style/RedundantBegin:
+  Enabled: false
+
+Style/RedundantParentheses:
+  Enabled: false
+
+Style/StringConcatenation:
+  Enabled: false
+
+Style/TernaryParentheses:
+  Enabled: false
+
+Style/WordArray:
+  Enabled: false
+
+RSpec/AnyInstance:
+  Enabled: false
+
+RSpec/ExampleLength:
+  Enabled: true
+  Max: 16
+
 # Impossible to satisfy these rules in specs
 RSpec/ExpectInHook:
   Enabled: false