Fix structure issue of MIB files

The ticket link:

https://arraynetworks.atlassian.net/browse/TWSD-1271
There are two issues in the MIB structure:

1. Duplicate index

2. Undefined symbol(items)
To resolve the issue,

I changed the name of the index, and modified the text where it used(Replace the index to new one).

Such as nodeIndex to nodeStatsIndex

Others like: servicetapIndex under the TapEntry block, maybe is copied from other place but it doesn't change the name then cause duplicate.
Besides,

there is no policyBytesDeny maybe there is typo or the name is changed.

so I use exist symble, such as policyToBytesDeny, policyToPacketsDeny instead.
I have test it by the commad:

snmptranslate -m +/ca/etc/mibs/CA-SNMP-MIB.txt -Tp .1.3.6.1.4.1.7564 | head -50

and

snmptranslate -m /ca/etc/mibs/CA-SNMP-MIB.txt -IR -On beijingArrayNetworks
You can see attachment for example.
I also remove some useless spaces in the end of the line.