Support deleting routes by tag

[killcity]

Is there a way to setup an override that will send 0% traffic to nodes that have a specific tag. That way we can still see the node is a member of the pool but temporarily not having any traffic sent to it because of it's tag status.

Examples:

Route set to 0% based on tag "maint_mode" (using -1 as an example of sending 0% traffic)
route weight appservice testsite.com/app weight -1 tags "maint_mode"

Route deleted based on tag "maint_mode"
route del appservice testsite.com/app tags "maint_mode"

Cheers

[magiconair]

Like `route del svc tags "tag"`? We were just talking about this. Not hard to add but not there yet.

[killcity]

Yah, precisely. Looks like you read my comment before I edited with examples. You're too quick. :)

[magiconair]

I'll add that after I've fixed the weighing bug. (#186)

[killcity]

Thanks again. Need to learn Go for 2017 so I can contribute :)

[magiconair]

Implementing this pushed me into refactoring the table parser tests a bit more. This patch adds support for

# delete routes of <svc> which have tags 'a' and 'b'
route del svc tags "a,b"

# delete routes which have tags 'a' and 'b'
route del tags "a,b"

[magiconair]

Merged the change to master. Please test.