Fix nodeos tests to work on arch linux

tests/testUtils.py

@@ -1769,7 +1769,8 @@ class Cluster(object):
         nodes=[]
 
         pgrepOpts="-fl"
-        if platform.linux_distribution()[0] == "Ubuntu" or platform.linux_distribution()[0] == "LinuxMint" or platform.linux_distribution()[0] == "Fedora":
+        if platform.linux_distribution()[0] == "Ubuntu" or platform.linux_distribution()[0] == "LinuxMint" or platform.linux_distribution()[0] == "Fedora" or\
+                platform.linux_distribution()[0] == "arch":
             pgrepOpts="-a"
 
         endTime=time.time()+timeout