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The driving idea is that nodes with less labels are more generic,
nodes with more labels are more specialized and should be used by
executions that do not have those labels only as a last resort

Tune the new scheduler policies: prefer hosts without labels and reset the size of execution in the queue to implement back-filling

Implement the DYNSIZE scheduler policy that automatically calculates a size and dynamically makes it smaller when the zapp is waiting in the queue

Fix several bugs

See merge request !66

Small fix for broken executions

See merge request !65

Add a link to plots in grafana (Eurecom specific)

See merge request !64

Use only IP addresses as keys in node_dict (fixes #62 on github)

See merge request !63

Remove left-over code in Kubernetes package (fixes #61 on github)

See merge request !62

Better logging of why services cannot be fitted on nodes

See merge request !61