Sets parameters for a shared memory zone of limit_conn_zone

[suquant]

Sets parameters for a shared memory zone that will keep states for various keys of limit_conn_zone

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[k8s-reviewable]

This change is 

[coveralls]

Coverage increased (+0.009%) to 44.384% when pulling e3bb44d79d5a54c9ce7ebcfaa8822f5cd0ae77ec on suquant:limit-conn-zone-variable into 4aef07d on kubernetes:master.

[coveralls]

Coverage increased (+0.02%) to 44.397% when pulling c540afb7befaf4e4a31d6a733c165c33d31924e0 on suquant:limit-conn-zone-variable into 4aef07d on kubernetes:master.

[coveralls]

Coverage increased (+0.009%) to 44.384% when pulling d56e261 on suquant:limit-conn-zone-variable into 4aef07d on kubernetes:master.

[coveralls]

Coverage increased (+0.02%) to 44.397% when pulling d56e261 on suquant:limit-conn-zone-variable into 4aef07d on kubernetes:master.

[coveralls]

Coverage increased (+0.009%) to 44.384% when pulling d56e261 on suquant:limit-conn-zone-variable into 4aef07d on kubernetes:master.

[aledbf]

/lgtm

[aledbf]

@suquant thanks!