Remove "dechainify VLAN" code from dbsync_slave
Remove "dechainify VLAN" code from dbsync_slave

This is no longer needed, as the creation of VLANs-on-VLANs is not possible anymore (for about two years), and this function therefore causes unnecessary overhead in xapi's startup sequence. Removed an unused function from the same module as well.

Signed-off-by: Rob Hoes <8783b3376fb07d39edffc8d7da68a6de3874a7e6@citrix.com>

djs55/squeezed,koushikcgit/xcp-rrdd,djs55/xcp-rrdd,djs55/xcp-rrdd,koushikcgit/xcp-rrdd,koushikcgit/xcp-networkd,johnelse/xcp-rrdd,koushikcgit/xcp-networkd,robhoes/squeezed,simonjbeaumont/xcp-rrdd,johnelse/xcp-rrdd,djs55/xcp-networkd,koushikcgit/xcp-rrdd,sharady/xcp-networkd,djs55/xcp-networkd,sharady/xcp-networkd,simonjbeaumont/xcp-rrdd