copr-be: move the builder quota to inventory

.. and cleanup the copr-be.conf.j2 template a but.  Many of the options
has not been used for quite some time.

inventory/group_vars/copr

@@ -21,3 +21,10 @@ ansible_ifcfg_blacklist: true
 copr_aws_region: us-east-1
 
 datacenter: cloud
+
+builders:
+    # max|max_spawn|max_prealloc
+    aws:
+        x86_64: [100,20,30]
+        armhfp: [20,5,5]
+        aarch64: [20,10,10]

inventory/group_vars/copr_dev

@@ -22,3 +22,10 @@ ansible_ifcfg_blacklist: true
 copr_aws_region: us-east-1
 
 services_disabled: true
+
+builders:
+    # max|max_spawn|max_prealloc
+    aws:
+        x86_64: [20,5,5]
+        armhfp: [3,1,1]
+        aarch64: [5,2,2]