NMS-6688: Documentation SSLCertMonitor

- Created documentation based on source code, no Wiki available
- Include in main document
NMS-6731: Provisioning guide has broken images

- Removed same link reference for all images in Provisioning guide
- Added image directory to main pom.xml of the opennms-doc module
Merge pull request #53 from indigo423/NMS-6731-Provisioning-Guide-broken-images

NMS-6731: Provisioning guide has broken images
Update SSLCertMonitor.adoc

Explain the use cases for the SSLCertMonitor and where it won't work.
Merge pull request #2 from roskens/patch-2

Update SSLCertMonitor.adoc
Merge pull request #52 from indigo423/NMS-6688-doc-SSLCertMonitor

NMS-6688: Documentation SSLCertMonitor
Creation of ImapMonitor documentation for Jira NMS-6656

Signed-off-by: Ronny Trommer <ronny@opennms.org>