vlan on top of bond interfaces assumes bond[0-9]+ naming

[JuanJo Ciarlante]

Context: deploying nodes via maas with bonds and vlans
on top of them, in particular for the example below:
bong-stg and bond-stg.600

~# dpkg-query -W vlan
vlan 1.9-3.2ubuntu1.16.04.1

* /etc/network/interfaces excerpt as setup by Maas
  (obfuscated for ip and mac addresses)

[...]
auto bond-stg
iface bond-stg inet static
    address x.x.x.x/x
    bond-xmit_hash_policy layer2
    bond-slaves none
    hwaddress ether xx:xx:xx:xx:xx:xx
    bond-miimon 100
    bond-lacp_rate slow
    mtu 9000
    bond-mode 802.3ad

[...]
auto bond-stg.600
iface bond-stg.600 inet static
    address x.x.x.x/x
    vlan_id 600
    vlan-raw-device bond-stg
    mtu 9000

* FYI bong-stg is properly brought up

* upping bong-stg.600 fails with:

~# ifup bond-stg.600
/etc/network/if-pre-up.d/mtuipv6: line 9: /sys/class/net/bond-stg.600/mtu: No such file or directory
/etc/network/if-pre-up.d/mtuipv6: line 10: /proc/sys/net/ipv6/conf/bond-stg.600/mtu: No such file or directory
Set name-type for VLAN subsystem. Should be visible in /proc/net/vlan/config
iface bond-mgmt inet manual
cat: /sys/class/net/bond-stg.600/mtu: No such file or directory
Device "bond-stg.600" does not exist.
bond-stg.600 does not exist, unable to create bond-stg.600
run-parts: /etc/network/if-pre-up.d/vlan exited with return code 1
Failed to bring up bond-stg.600.

- this happens because /etc/network/if-pre-up.d/vlan
  hardcodes bond names to be bond[0-9][0-9]*

* changing above regexp to bond[^.]* fixes it
 (modulo the mtu error):

~# ifup bond-stg.600
/etc/network/if-pre-up.d/mtuipv6: line 9: /sys/class/net/bond-stg.600/mtu: No such file or directory
/etc/network/if-pre-up.d/mtuipv6: line 10: /proc/sys/net/ipv6/conf/bond-stg.600/mtu: No such file or directory
Set name-type for VLAN subsystem. Should be visible in /proc/net/vlan/config
Added VLAN with VID == 600 to IF -:bond-stg:-

* diff for above changes to /etc/network/if-pre-up.d/vlan
- http://paste.ubuntu.com/24784957/