[FIXED JENKINS-23084] Support absolute paths in "Parameters from properties file".
[JENKINS-23084] [FIXED JENKINS-22229] Allow using parameter files even if no workspace exists.
[JENKINS-23084] Create parent directories in tests.
[JENKINS-23084] Changed the steps to create a test file.
Merge pull request #66 from ikedam/feature/JENKINS-23084_SupportAbusoluteInFileParameters

[JENKINS-23084] support abusolute in file parameters