vlan: set default reorder_hdr=on (Closes: #43330).

Replaced "egrep" with "grep -E", "fgrep" with "grep -F".

openvswitch: add OVS_REMOVE=yes to default/options if it is not there.

openvswitch: remove interfaces by default after putting them down.
openvswitch: setup port and bond after the bridge.

ovsport: OVS_PATCH option (Closes: #39708).
ovsport: HOST must be set.
ovsport: BRIDGE must be set.
ovsbond: BRIDGE must be set.
ovsbond: support VLAN id (Closes: #39707).
openvswitch: remove interface before create (Closes: #39709).

Don't use deprecated PreReq.
systemd: Fixed network.service dependencies (closes: #40780).

Drop Requires: startup.

dhcpcd: Support dhcpcd-9 pidfiles location.
dhcpcd: Stop dhcpcd if -4 or -6 options were used.
contrib: Increase DHCP_GRACE_TIME value.
dhcpcd: Use DHCP_GRACE_TIME again.

Removed ncpfs from dependencies.

added openvswitch support from the our openvswitch package
fixed OVS_OPTIONS and OVS_EXTRA usage for interfaces with TYPE=ovsbr

drop syslog from Should-Start in LSB header sysvinit script (Closes: #37237)

some errs fixed

iface status check for ifdown added (Closes: #22658)
loading of kernel module 8021q disabled in VE (patch by Denis Yagofarov) (Closes: #13607)
dhcpd service stop fixed (Closes: #19582)
fixed unable to manage bridge ifaces on 2.6.32 OpenVZ kernels (patch by Nikolay A. Fetisov) (Closes: #33296)

dropped iftab/ifrename support

remove incorrect quotation when doing restart (Closes: #35943)

return method from source_optfile() changed from "continue" to "return"