I was able to get SSH access to the system and did the following to solve my problem. Solution taken from the [Removing and Disabling][1] Plugins wiki page.
touch /var/lib/jenkins/plugins/splunk-devops.jpi.disabled
touch /var/lib/jenkins/plugins/splunk-devops-extend.jpi.disabled
Then, I rebooted. From the documentation, I assume that this is possible with any plugin.
You can get more information here! https://wiki.jenkins-ci.org/display/JENKINS/Removing+and+disabling+plugins & Also in Mindmajix.com
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