Feature 57 (config and provisioning): modules declare config and provisions, their files rendered from templates; synced with main (issues of feature 57, 874)

modules/hostname/files/hostname

@@ -0,0 +1 @@
+${config:hostname}

modules/hostname/files/hosts

@@ -0,0 +1,7 @@
+# The machine's own names (module hostname, novox/hq ADR 0199, ADR 0223). Every line outside this
+# block is the operator's: kept across every push, changed through the node-hostname verbs add and
+# remove, and given back when this module goes. The mesh's names are not here: the mesh's resolver
+# answers them.
+127.0.0.1	localhost
+::1	localhost
+127.0.1.1	${machine:name}