Add timeout to jenkins API calls #611

Job	Run time
integration-tests / Get runner image / Get runner image	5s
integration-tests / Build and push charm	2m 20s
integration-tests / Build image / Get images	4s
integration-tests / Build rock / Get rocks	4s
integration-tests / Build rock / Build rock (jenkins_rock)	5m 3s
integration-tests / Build image / Build image	0s
integration-tests / Get rocks or Docker images	1s
integration-tests / Integration tests / Integration tests (test_jenkins.py)	17m 57s
integration-tests / Integration tests / Integration tests (test_k8s_agent.py)	17m 42s
integration-tests / Integration tests / Integration tests (test_machine_agent.py)	23m 21s
integration-tests / Integration tests / Integration tests (test_plugins.py)	42m 29s
integration-tests / Integration tests / Integration tests (test_proxy.py)	17m 56s
integration-tests / Integration tests / Integration tests (test_cos.py)	25m 2s
integration-tests / Required Integration Test Status Checks	1s
	2h 32m 5s

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