[source] hostapd: add acct_interval option

[LEDE Commits]

jow pushed a commit to source.git, branch lede-17.01:
https://git.lede-project.org/ef3649d90e0b799a3a6efc45a77ae1d1719c9842

commit ef3649d90e0b799a3a6efc45a77ae1d1719c9842
Author: Yury Shvedov <yshvedov at wimarksystems.com>
AuthorDate: Tue Jun 27 10:34:49 2017 +0300

    hostapd: add acct_interval option
    
    Make an ability to configure Accounting-Interim-Interval via UCI
    
    Signed-off-by: Yury Shvedov <yshvedov at wimarksystems.com>
    [add hostapd prefix, cleanup commit message]
    Signed-off-by: Stijn Tintel <stijn at linux-ipv6.be>
    (cherry picked from commit 0e7bbcd43b6f4b54ecc5c40130b5f86cbc9f1c07)
---
 package/network/services/hostapd/files/hostapd.sh | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/package/network/services/hostapd/files/hostapd.sh b/package/network/services/hostapd/files/hostapd.sh
index e3fc036..d42b6a0 100644
--- a/package/network/services/hostapd/files/hostapd.sh
+++ b/package/network/services/hostapd/files/hostapd.sh
@@ -154,6 +154,7 @@ hostapd_common_add_bss_config() {
 	config_add_string acct_server
 	config_add_string acct_secret
 	config_add_int acct_port
+	config_add_int acct_interval
 
 	config_add_string dae_client
 	config_add_string dae_secret
@@ -211,8 +212,8 @@ hostapd_set_bss_options() {
 		wps_pushbutton wps_label ext_registrar wps_pbc_in_m1 wps_ap_setup_locked \
 		wps_independent wps_device_type wps_device_name wps_manufacturer wps_pin \
 		macfilter ssid wmm uapsd hidden short_preamble rsn_preauth \
-		iapp_interface eapol_version acct_server acct_secret acct_port \
-		dynamic_vlan ieee80211w
+		iapp_interface eapol_version dynamic_vlan ieee80211w \
+		acct_server acct_secret acct_port acct_interval
 
 	set_default isolate 0
 	set_default maxassoc 0
@@ -257,6 +258,8 @@ hostapd_set_bss_options() {
 		append bss_conf "acct_server_port=$acct_port" "$N"
 		[ -n "$acct_secret" ] && \
 			append bss_conf "acct_server_shared_secret=$acct_secret" "$N"
+		[ -n "$acct_interval" ] && \
+			append bss_conf "radius_acct_interim_interval=$acct_interval" "$N"
 	}
 
 	local vlan_possible=""