slapos-testing, slapos-sr-testing: Don't duplicate instance.cfg prologue that...

slapos-testing, slapos-sr-testing: Don't duplicate instance.cfg prologue that is already provided by stack/nxdtest/instance.cfg

This software releases switched to nxdtest in 1536ad2e (software/slapos-testing: use nxdtest)
and 3a1e5628 (software/slapos-sr-testing: use nxdtest). So there is no
longer need to duplicate that standard instance prologue that is
provided by stack/nxdtest/instance.cfg:

https://lab.nexedi.com/nexedi/slapos/blob/0803b816/stack/nxdtest/instance.cfg.in#L1-8

/reviewed-by @jerome
/reviewed-on !94

software/slapos-sr-testing/buildout.hash.cfg

@@ -15,4 +15,4 @@
 
 [template]
 filename = instance.cfg
-md5sum = 5ba23849f0b9bcfbe2534314ce7f48e8
+md5sum = 5d1320a9b1d2828f2870e3096f1c2bfb

software/slapos-sr-testing/instance.cfg

 [buildout]
 extends = {{ nxdtest_instance }}
-parts =
-  runTestSuite
+parts +=
   publish
 
-eggs-directory = {{ buildout['eggs-directory'] }}
-develop-eggs-directory = {{ buildout['develop-eggs-directory'] }}
-offline = true
-
 [slap-configuration]
 recipe = slapos.cookbook:slapconfiguration
 computer = ${slap-connection:computer-id}

software/slapos-testing/buildout.hash.cfg

@@ -15,4 +15,4 @@
 
 [template]
 filename = instance.cfg
-md5sum = 3b1b386f6ad4c9ac50ab1f1e1384e751
+md5sum = a6091981a78cb2b10a97e431adc7615c

software/slapos-testing/instance.cfg

 [buildout]
 extends = ${nxdtest-instance.cfg:rendered}
-parts =
-  runTestSuite
+parts +=
   publish
 
-eggs-directory = ${buildout:eggs-directory}
-develop-eggs-directory = ${buildout:develop-eggs-directory}
-offline = true
-
 [slap-configuration]
 recipe = slapos.cookbook:slapconfiguration
 computer = $${slap-connection:computer-id}