mis-leading service is already running error when connections cant be loaded

[johnsmyth]

Describe the bug
When attempting to start steampipe service, if connections are defined (in .spc) files that reference plugins that are NOT installed, steampipe fails with: Error: Another Steampipe service is already running. Use steampipe service stop --force to kill all running instances before continuing.. This is misleading - the error should state that the connections could not be created because the plugin is not installed.

Steampipe version (steampipe -v)
Docker image, v0.7.3

To reproduce
create a connection file for a plugin that is not installed, and attempt to start the steampipe service.

Expected behavior
The help message should lead then user to the solution - the connections could not be created because the plugin is not installed.

Additional context
This was reported by @graza-io -- See this thread for details: https://steampipe.slack.com/archives/C01UECB59A7/p1629468281142200