Add misc license detection rules

Signed-off-by: Philippe Ombredanne <[email protected]>

Author: pombredanne

src/licensedcode/data/rules/dco-1.1_16.RULE

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+### Sign your work
+
+The sign-off is a simple line at the end of the explanation for the patch. Your
+signature certifies that you wrote the patch or otherwise have the right to pass
+it on as an open-source patch. The rules are pretty simple: if you can certify
+the below (from [d{{ evelopercertificate.org }}]( {{ http://developercertificate.org/ }})):

src/licensedcode/data/rules/dco-1.1_16.yml

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+license_expression: dco-1.1
+is_license_notice: yes
+ignorable_urls:
+    - http://developercertificate.org/

src/licensedcode/data/rules/dco-1.1_17.RULE

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+Please see https://developercertificate.org/ for
+more info, as well as to make sure that you can attest to the rules listed. Our CI uses the [DCO Github app](https://github.com/apps/dco) to ensure
+that all commits in a given PR are signed-off.

src/licensedcode/data/rules/dco-1.1_17.yml

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+license_expression: dco-1.1
+is_license_notice: yes
+ignorable_urls:
+    - https://developercertificate.org/
+    - https://github.com/apps/dco

src/licensedcode/data/rules/false-positive_134.RULE

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+Some helpers are only available if
+the license is deemed compatible with the GPL.

src/licensedcode/data/rules/false-positive_134.yml

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+is_false_positive: yes
+notes: Comment in ebpf in github.com/cilium/ebpf/prog.go

src/licensedcode/data/rules/false-positive_139.RULE

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+uint32 gpl_compatible           uint32

src/licensedcode/data/rules/false-positive_139.yml

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+is_false_positive: yes
+notes: Comment in ebpf in github.com/cilium/ebpf/

src/licensedcode/data/rules/false-positive_141.RULE

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+License        *License     `json:"license,omitempty"`

src/licensedcode/data/rules/false-positive_141.yml

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+is_false_positive: yes
+notes: not a license statement