Adds logging and SSHKit backend host configuration for

ssh_options. Also updates gemspec requirements to support ed25519
elliptic keys in net/ssh

next cleanup: change hardcoded ssh_options in
lib/loom/host_spec.rb to come from the config. pass in from
inventory.rb

more info:
net-ssh/net-ssh#565
net-ssh/net-ssh#476
net-ssh/net-ssh#175

lib/loom/dsl.rb

@@ -31,6 +31,7 @@ def on_host(host_specs, &run_block)
         sshkit_backend = self
 
         begin
+          # TODO: document the reciever of this yield
           yield sshkit_backend, host_spec
         rescue SocketError => e
           Loom.log.error "error connecting to host => #{host_spec.hostname}"
@@ -53,6 +54,7 @@ def on_host(host_specs, &run_block)
       end
     end
 
+    # TODO: Why did I make this "shadow" class?
     class SSHKitDSLShadow
       extend SSHKit::DSL
     end

lib/loom/host_spec.rb

@@ -11,6 +11,8 @@ class HostSpec
     attr_accessor :disabled
     attr_reader :sshkit_host
 
+    # TODO: change this to take an sshkit_host and make parse public. Stop calling parse from the
+    # ctor.
     def initialize(host_string)
       @sshkit_host = parse host_string
     end
@@ -26,7 +28,15 @@ def is_localhost?
 
     private
     def parse(host_string)
-      SSHKit::Host.new host_string
+      host = SSHKit::Host.new host_string
+      host.ssh_options = {
+        :auth_methods => ['publickey'],
+        :keys => ["~/.ssh/id_esd25519_2"],
+        :verbose => :debug,
+      }
+      Loom.log.debug1(self) { "parsing hoststring[#{host_string}] => #{host}" }
+      Loom.log.debug1(self) { "netssh options for host[#{host}] => #{host.netssh_options}" }
+      host
     end
   end
 end

loom.gemspec

@@ -18,6 +18,7 @@ Gem::Specification.new do |s|
   s.add_dependency 'sshkit', '~> 1.11'
   s.add_dependency 'commander', '~> 4.4'
 
+  # *** Obsolete, see new issue below ***
   # Need net-ssh beta and its explicit requirements until for ed25519
   # elliptic curve key support
   # https://github.com/net-ssh/net-ssh/issues/214
@@ -28,7 +29,11 @@ Gem::Specification.new do |s|
   # s.add_dependency 'net-ssh', '>= 4.0.0.beta3'
   s.add_dependency 'net-ssh', '>= 3'
   s.add_dependency 'rbnacl-libsodium', '1.0.10'
-  s.add_dependency 'bcrypt_pbkdf', '1.0.0.alpha1'
+  s.add_dependency 'bcrypt_pbkdf', '<2.0'
+
+  # New net-ssh requiremetns for ed25519
+  # https://github.com/net-ssh/net-ssh/issues/565
+  s.add_dependency 'ed25519', '<2.0'
 
   s.add_development_dependency 'bundler', '~> 1.13'
   s.add_development_dependency 'rake', '~> 11.3'