Fix options.update is not 'all' if no config
Fix options.update is not 'all' if no config

If the user does not have 'update' in their configuration
ensure we are properly defaulting to 'all' and not None.

Change-Id: I65ddc49066119db0947801203ac88cb69153d1b0
Signed-off-by: Thanh Ha <ddef40ffcf330e0c1e91b15bb1b0d4953f1680d8@linux.com>

wsoula/jenkins-job-builder,gforcada/jenkins-job-builder,puppetlabs/jenkins-job-builder,gforcada/jenkins-job-builder,puppetlabs/jenkins-job-builder,puppetlabs/jenkins-job-builder,wsoula/jenkins-job-builder,gforcada/jenkins-job-builder,puppetlabs/jenkins-job-builder,wsoula/jenkins-job-builder,gforcada/jenkins-job-builder,gforcada/jenkins-job-builder,wsoula/jenkins-job-builder