net/virt_lib.sh: Fix quoting default variable on dash

Dash (and maybe some other posix shells) needs quoting whole argument,
otherwise it's not able to assign:

/opt/ltp/testcases/bin/ipvlan01.sh: 384: local: l2,mode: bad variable name
/opt/ltp/testcases/bin/vlan01.sh: 360: local: ,protocol: bad variable name

The problem was in $opt, change also $start_id to use the same convention.

Fixes: dcacbcf ("network/virt: add test-case 01 to virt_lib.sh")
       94aac42 ("network/virt: add test-case 02 to virt_lib.sh")

Signed-off-by: Petr Vorel <[email protected]>
Acked-by: Cyril Hrubis <[email protected]>

Author: pevik

testcases/network/virt/virt_lib.sh

@@ -356,8 +356,8 @@ virt_netperf_msg_sizes()
 # OPTIONS - different options separated by comma.
 virt_test_01()
 {
-	start_id=${start_id:-"1"}
-	local opts=${1:-""}
+	start_id="${start_id:-1}"
+	local opts="${1:-}"
 	local n=0
 
 	while true; do
@@ -380,8 +380,8 @@ virt_test_01()
 # OPTIONS - different options separated by comma.
 virt_test_02()
 {
-	start_id=${start_id:-"1"}
-	local opts=${1:-""}
+	start_id="${start_id:-1}"
+	local opts="${1:-}"
 	local n=0
 
 	while true; do