Benchmarking features 2.0

Modified the gitlab-ci for benchmarking purposes
Created a new Dockerfile for benchmarking purposes, which includes the
intel compiler.
Docker file now has likwid installed as well.
Created a machine file for the benchmarking machine.
Kerncraft updated and fixed.

TODOs:
    - cleanup of the yaml files
    - Test the Skylake machine file and kerncraft_coupling for correct
      behaviour

kerncraft_coupling/kerncraft_interface.py

@@ -154,6 +154,8 @@ class KerncraftParameters(DotDict):
         self['cache_predictor'] = 'SIM'
         self['verbose'] = 0
         self['pointer_increment'] = 'auto'
+        self['iterations'] = 10
+
 
 # ------------------------------------------- Helper functions ---------------------------------------------------------