Refactor documents upload. Add bid proposal document. Refactor clients. Make single client for cdb. Improve client time sync. #286

Job	Run time
black	9s
pytest-fast (reporting)	20s
flake8	6s
pytest-fast (negotiation)	1m 56s
pytest-fast (negotiation_quick)	1m 8s
pytest-fast (below_threshold)	18s
pytest-fast (below_threshold_multilot)	13s
pytest-fast (above_threshold_eu)	34s
pytest-fast (above_threshold_eu_multilot)	12s
pytest-fast (above_threshold_eu_plan)	13s
pytest-fast (above_threshold_eu_tender)	13s
pytest-fast (above_threshold_ua)	25s
pytest-fast (above_threshold_ua_multilot)	14s
pytest-fast (above_threshold_ua_features)	28s
pytest-fast (above_threshold_ua_multilot_features)	13s
pytest-fast (above_threshold_ua_lcc)	34s
pytest-fast (above_threshold_ua_multilot_lcc)	12s
pytest-fast (close_framework_agreement_ua)	28s
pytest-fast (close_framework_agreement_ua_central)	31s
pytest-fast (competitive_dialogue_eu)	33s
pytest-fast (competitive_dialogue_ua)	38s
pytest-fast (esco)	28s
pytest-fast (esco_features)	26s
pytest-fast (esco_multilot)	15s
pytest-fast (simple_defense)	22s
	11m 9s

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