Add Exoscale provider

[pierre-emmanuelJ]

This Pull Request add the Implementation of the Exoscale provider.

Usage

Exoscale:
    provider:       "exoscale"
    api_key:        The Exoscale API key (required)
    api_secret:     The Exoscale API secret key (required)
    api_endpoint:   The Exoscale API endpoint
    tag_key:        The tag key to filter on
    tag_value:      The tag value to filter on
    zone:           The Exoscale Zone
    addr_type:      "public_v4" or "public_v6". (default: "public_v4")

[hashicorp-cla]

All committers have signed the CLA.

[pierre-emmanuelJ]

Test deployed with Terraform test/tf/exoscale.

Integration tests ✅ :

go test -v ./provider/exoscale
=== RUN   TestAddrs
2020/06/30 16:53:06 [DEBUG] discover-exoscale: Using zone= tag_key=, tag_value=, addr_type=public_v4
2020/06/30 16:53:06 [DEBUG] discover-exoscale: Found instance test-02 - with public_v4 IP: 159.100.xxx.xxx
2020/06/30 16:53:06 [DEBUG] discover-exoscale: Found instance test-01 - with public_v4 IP: 89.145.xxx.xxx
2020/06/30 16:53:06 [DEBUG] discover-exoscale: Found ip addresses: [159.100.xxx.xxx 89.145.xxx.xxx]
--- PASS: TestAddrs (0.27s)
=== RUN   TestAddrsZone
2020/06/30 16:53:06 [DEBUG] discover-exoscale: Using zone=ch-gva-2 tag_key=, tag_value=, addr_type=public_v4
2020/06/30 16:53:06 [DEBUG] discover-exoscale: Found instance test-02 - with public_v4 IP: 159.100.xxx.xxx
2020/06/30 16:53:06 [DEBUG] discover-exoscale: Found ip addresses: [159.100.xxx.xxx]
--- PASS: TestAddrsZone (0.33s)
=== RUN   TestAddrsTags
2020/06/30 16:53:06 [DEBUG] discover-exoscale: Using zone= tag_key=test-01, tag_value=consul, addr_type=public_v4
2020/06/30 16:53:06 [DEBUG] discover-exoscale: Found instance test-01 - with public_v4 IP: 89.145.xxx.xxx
2020/06/30 16:53:06 [DEBUG] discover-exoscale: Found ip addresses: [89.145.xxx.xxx]
--- PASS: TestAddrsTags (0.19s)
=== RUN   TestAddrsIPv6
2020/06/30 16:53:06 [DEBUG] discover-exoscale: Using zone= tag_key=, tag_value=, addr_type=public_v6
2020/06/30 16:53:07 [DEBUG] discover-exoscale: Found instance test-02 - with public_v6 IP: 2a04:c43:e00:46b0:4f7:xxxx:xxxx
2020/06/30 16:53:07 [DEBUG] discover-exoscale: Found ip addresses: [2a04:c43:e00:46b0:4f7:xxxx:xxxx]
--- PASS: TestAddrsIPv6 (0.19s)
PASS
ok  	github.com/hashicorp/go-discover/provider/exoscale	0.991s

[pierre-emmanuelJ]

no pagination? 😿

@greut f9fbb6c 😃