SLES pxp-agent init script has syntax error if there is more than one pxp-agent process running

Hello all,

I have found that with the current init script for the pxp-agent process on SLES boxes [here|https://github.com/puppetlabs/pxp-agent/blob/master/ext/suse/pxp-agent.init] has a syntax error if there is more than one pxp-agent process running at the time of use. Particularly, lines 99 and 179. This is because:

For bash tests, the syntax that is correct in this case is `[ x -eq y ]` which works when there is one process of pxp-agent running. If there is more than one pxp-agent process running, this turns the test in those two lines into `[ x -eq y z ]`, which is syntactically incorrect, and results in a syntax error at [. I have identified a fix and have tested it on several SLES boxes in my agent fleet, and will be submitting a PR to the pxp-agent GitHub project.