Add support for ietf-schedule basic recurrence #1363

Job	Run time
check-trigger	4s
unit-test / Build infix x86_64_minimal	2m 6s
build-x86_64 / Build infix x86_64_minimal	29m 27s
build-aarch64 / Build infix aarch64_minimal	27m 34s
build-arm / Build infix arm_minimal	28m 44s
test-run-x86_64 / Regression Test infix x86_64_minimal	1h 6m 25s
test-publish-x86_64	0s
	2h 34m 20s

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