Replace confparse w netutils

[jvanderaa]

Fixes #1550

This replaces parsing with Netutils to handle parsing of configuration lines.

Testing thus far has been in a separate Python script that will get added as well to the PR. There were no previous tests written for the previous parser, so I found a basic BGP config for the first part to get the section bgp. The second and third configurations are tests with data from Cisco's documentation.

 python try_netutils_config_parse.py
>>> NAPALM CURRENT HELPER (SECTION PARSING)
['router bgp 65010', ' bgp log-neighbor-changes', ' network 192.168.1.0', ' neighbor 192.0.2.1 remote-as 65550']
['router bgp 65010', ' bgp log-neighbor-changes', ' network 192.168.1.0', ' neighbor 192.0.2.1 remote-as 65550']
<<<< NETUTILS HELPER

>>> NAPALM CURRENT HELPER (BGP PARSING)
[' bgp listen range 172.21.0.0/16 peer-group group172', ' neighbor group172 peer-group', ' neighbor group172 remote-as 45000', ' neighbor group172 activate']
[' bgp listen range 172.21.0.0/16 peer-group group172', ' neighbor group172 peer-group', ' neighbor group172 remote-as 45000', ' neighbor group172 activate']
<<<< NETUTILS HELPER

>>> NAPALM CURRENT HELPER (BGP Parsing)
[' address-family ipv4 multicast', ' address-family ipv4 vrf vpn1']
[' address-family ipv4 multicast', ' address-family ipv4 vrf vpn1']
<<<< NETUTILS HELPER

This shows the use cases that have been presented in ios.py around BGP parsing and section parsing.

[mirceaulinic]

Except a minor change, this looks good to me.

Deferring to @ktbyers for more input.

[ktbyers]

LGTM, let's remove that one logger.error line and we should be good to go.

[mirceaulinic]

Noice!

[z-8-d]

May I ask when napalm could have a release(or a cherry-pick) for this change please?

[z-8-d]

@mirceaulinic @ktbyers @jvanderaa - Would you please kindly show the plan when we could have the new release with the feature in this PR?

[ktbyers]

The next release depends on when Mircea gets a chance to do it. I think it should be shortly (i.e. in the next few weeks).

But the code is there i.e. just git clone the develop branch or git clone to the commit right after this is incorporated i.e. there is nothing stopping you from getting and using the code.

@z-8-d

[z-8-d]

@ktbyers - Thanks for your information!