Fixed several issues in the interface state

Fixed:
   * The udev-rules template is not tested
   * Wrong unicode character in the template leads to udev ignoring
     the rule completely
   * The template is unable to be rendered due to absent import
   * udev is not retrigerred with new rules

Change-Id: I134b5e49b883afcc5e34feaaa561d7ca70192796
Closes-Bug: PROD-16649

linux/files/60-net-txqueue.rules

-KERNEL==”tap[0-9a-z\-]*", RUN+="/sbin/ip link set %k txqueuelen {{ network.tap_custom_txqueuelen }}"
+KERNEL=="tap[0-9a-z\-]*", RUN+="/sbin/ip link set %k txqueuelen {{ tap_custom_txqueuelen }}"

linux/network/interface.sls

   - source: salt://linux/files/60-net-txqueue.rules
   - mode: 755
   - template: jinja
+  - defaults:
+    tap_custom_txqueuelen: {{ network.tap_custom_txqueuelen }}
+
+udev_reload_rules:
+  cmd.run:
+  - name: "/bin/udevadm control --reload-rules"
+  - onchanges:
+    - file: /etc/udev/rules.d/60-net-txqueue.rules
+
+udev_retrigger:
+  cmd.run:
+  - name: "/bin/udevadm trigger --attr-match=subsystem=net"
+  - onchanges:
+    - udev_reload_rules
 
 {%- endif %}

tests/pillar/network_extended.sls

     hostname: linux
     fqdn: linux.ci.local
     network_manager: false
+    tap_custom_txqueuelen: 10000
     interface:
       eth0:
         enabled: true