store: Fix etcd atomic operations.
store: Fix etcd atomic operations.

- The TTL was set to 5 by error (I guess)
- There is no need to check the response, the operation fails.

Signed-off-by: Andrea Luzzardi <442ffe3ffbfd024afcf0b7f8b108d05bca3aae43@gmail.com>

sanimej/libkv,bsmr-docker/libkv,bprashanth/libkv,MHBauer/libkv,therealbill/libkv,KimTaehee/libkv,bprashanth/libkv,zyclonite/libkv,KimTaehee/libkv,therealbill/libkv,christophelec/libkv,polyverse-security/libkv,sanimej/libkv,DIREKTSPEED-LTD/libkv,MHBauer/libkv,christophelec/libkv,kasisnu/libkv,gonkulator/libkv,gonkulator/libkv,chenchun/libkv,polyverse-security/libkv,kasisnu/libkv,chenchun/libkv,zyclonite/libkv,DIREKTSPEED-LTD/libkv,moxiegirl/libkv,bsmr-docker/libkv,moxiegirl/libkv