* influxWriteData - support Influx tags
In order to better query data in Influx, tags needs to be written.
This change allows filling tag data via the Influx plugin.
influxWriteData requires a node to be executed.
In a declarative pipeline the POST section by default does not provide a node/agent.
This adds a parameter to force creation of a node/agent.
read yaml rule is a very frequently used rule. But having the rule in the common rules
means we cannot register text or files to that rule, which makes it less handy to work
with yaml files in the tests.
Starting point for that refactoring: it turned out that the tests
was not independent. The DefaultValueCache which is a singleton
keeps the status over various tests. Success of test execution depends
on the order test execution.
We have now
* a dedicated rule for resetting the default value cache
* JenkinsConfiguration rule (which already provided facilities for
dealing with the configuration) has been replaced by a readYaml rule.
From the PipelineUnit test framework we get already a handler for
libraryResource, which is also part of the setup of the default
values.
* An auxiliar class which combines the
* JenkinsSetupRule (registers the lib)
* JenkinsReadYamlRule (provides facilities for Yaml parsing)
* JenkinsResetDefaultValueCacheRule (cleans up the DefaultValueCache)
into a rule chain. By using this rule chain we ensure that our
setup OK (piper lib registered, and default config can be setup in
a clean way).
