Enable conversion for EX switches that have many Vlans configured on a trunked interface

[saidvandeklundert]

Ran into a situation where the tool did not read the vlan members as a leaf.

The added example9.conf illustrates this.

One of the lines of config produced by the current master branch:

set interfaces ae1 unit 0 family ethernet-switching vlan members [ VLAN101 VLAN102 VLAN103 VLAN110 VLAN684 VLAN310 VLAN699 VLAN700 VLAN702 VLAN703 VLAN704 VLAN705 VLAN706 VLAN708 VLAN709 VLAN710 VLAN711 VLAN712 VLAN713 VLAN740 VLAN741 VLAN800 VLAN801 VLAN802 VLAN811 VLAN812 VLAN813 VLAN814 VLAN815 VLAN816 VLAN817 
VLAN818 VLAN819 VLAN820 VLAN821 VLAN822 VLAN823 VLAN826 VLAN827 VLAN828 VLAN829 VLAN830 VLAN831 VLAN835 VLAN839 VLAN840 VLAN843 VLAN844 VLAN848 VLAN845 VLAN846 VLAN850 VLAN847 VLAN849 VLAN851 VLAN836 VLAN837 VLAN899 VLAN900 VLAN912 VLAN999 VLAN841 VLAN842 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 VLAN833 VLAN854 VLAN855 VLAN856 VLAN857 VLAN858 VLAN859 VLAN860 VLAN891 VLAN892 VLAN893 VLAN895 VLAN852 894 ]

With this change, every single VLAN is read as a leaf statement.

Added tests and confirmed all tests are failing.

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