Update dependencies for upstream changes

See https://github.com/latchset/tang/issues/126

debian/control

@@ -7,6 +7,7 @@ Vcs-Git: https://git.in-ulm.de/cbiedl/tang.git
 Build-Depends: debhelper-compat (= 13),
     asciidoctor,
     curl,
+    iproute2,
     jose,
     libhttp-parser-dev,
     libjansson-dev,

debian/tests/control

@@ -3,6 +3,7 @@ Depends:
     build-essential,
     cmake,
     curl,
+    iproute2,
     jose,
     libhttp-parser-dev,
     libjansson-dev,