[#77896146] Fix mms-agent-backup upgrade issue

- Because we changed from dpkg to package a command like this:
  `apt-get -y -d install mongodb-mms-monitoring-agent=2.1.2.43`
  is run which fails. need to add the "-1" to the version
- Updated monitorin agent as well and tested both agent installs with a dry run
Merge pull request #15 from Kabam/mms-agents-versionfix

[#77896146] Fix mms-agent-backup upgrade issue
- Because we changed from dpkg to package a command like this:
  `apt-get -y -d install mongodb-mms-monitoring-agent=2.1.2.43`
  is run which fails. need to add the "-1" to the version
- Updated monitorin agent as well and tested both agent installs with a dry run