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bootrc: make sure essid and wpapsk are used literally

bootrc was tokenizing essid and wpapsk fields,
they should be left alone and used as is as
password as well as essid can contain spaces.

--- a/sys/src/9/boot/bootrc

+++ b/sys/src/9/boot/bootrc

@@ -23,7 +23,7 @@

 # reparse variables

 for(i in `{ls -Qp /env}){

 	switch($i){

-	case '*'* 'fn#'* e820 apm0 apid ifs path pid prompt status ?

+	case '*'* 'fn#'* e820 apm0 essid wpapsk apid ifs path pid prompt status ?

 		# ignore these

 	case *

 		$i=`{echo $$i}

--- a/sys/src/9/boot/net.rc

+++ b/sys/src/9/boot/net.rc

@@ -5,7 +5,8 @@

 		if(~ $#essid 0)

 			essid=`{grep '^essid: ' $1/ifstats >[2]/dev/null | sed 's/^essid: //; q'}

 		if(! ~ $#essid 0){

-			x=(aux/wpa -s $"essid)

+			essid=$"essid

+			x=(aux/wpa -s $essid)

 			if(! ~ $#wpapsk 0){

 				echo 'key proto=wpapsk' `{!password=$"wpapsk whatis essid !password} > /mnt/factotum/ctl

 				wpapsk=()