remove redundant sourcing of ${serviceFns}

this is done by the oneshot and longrun functions

modules/dnsmasq/service.nix

@@ -26,7 +26,6 @@ longrun {
   inherit name;
   dependencies = [ interface ];
   run = ''
-    . ${serviceFns}
     ${dnsmasq}/bin/dnsmasq \
     --user=${user} \
     --domain=${domain} \

modules/network/address.nix

@@ -11,7 +11,6 @@ let
   # prefixes, or the same but different protocols
   name = "${interface.name}.a.${address}";
   up = ''
-    . ${serviceFns}
     dev=$(output ${interface} ifname)
     ip address add ${address}/${toString prefixLength} dev $dev
     (in_outputs ${name}

modules/profiles/gateway.nix

@@ -149,7 +149,6 @@ in {
       dependencies = [ config.services.wan ];
       name = "resolvconf";
       up = ''
-        . ${serviceFns}
         ( in_outputs ${name}
          echo "nameserver $(output ${config.services.wan} ns1)" > resolv.conf
          echo "nameserver $(output ${config.services.wan} ns2)" >> resolv.conf

modules/profiles/wap.nix

@@ -81,7 +81,6 @@ in {
       # 'A list of DNS server' but doesn't say what separates the
       # list members. Assuming it's a space or other IFS character
       up = ''
-        . ${serviceFns}
         ( in_outputs ${name}
         for i in $(output ${config.services.dhcpc} dns); do
           echo "nameserver $i" > resolv.conf

modules/secrets/outboard.nix

@@ -9,7 +9,6 @@ in longrun {
   inherit name;
   buildInputs = [ json-to-fstree ];
   run = ''
-    . ${serviceFns}
     ${optionalString (username != null) ''
       export NETRC=$(mkstate ${name})/netrc
       (echo default ; echo login ${username} ; echo password ${password} ) > $NETRC