Add sslpsk

See merge request nexedi/slapos!1460

software/beremiz-runtime/software.cfg

@@ -78,6 +78,7 @@ eggs = click
        opcua
        ${beremiz:egg}
        ${Twisted:egg}
+       sslpsk
 
 [instance-profile]
 recipe = slapos.recipe.template:jinja2
@@ -127,3 +128,4 @@ opcua = 0.98.13
 trollius = 2.2.1
 futures = 3.3.0
 cycler = 0.10.0
+sslpsk = 1.0.0