Global configuration log at start

[ldez]

What does this PR do?

Fix a regression on the global configuration log at the start of Traefik

before this PR:

time="2018-09-29T10:58:34Z" level=debug msg="Global configuration loaded "

after this PR (same behavior as Træfik <v1.7):

time="2018-09-29T10:58:34Z" level=debug msg="Global configuration loaded {\"LifeCycle\":{\"RequestAcceptGraceTimeout\":0,\"GraceTimeOut\":10000000000},\"GraceTimeOut\":0,\"Debug\":false,\"CheckNewVersion\":true,\"SendAnonymousUsage\":false,\"AccessLogsFile\":\"\",\"AccessLog\":null,\"TraefikLogsFile\":\"\",\"TraefikLog\":{\"format\":\"common\"},\"Tracing\":null,\"LogLevel\":\"DEBUG\",\"EntryPoints\":{\"http\":{\"Address\":\":80\",\"TLS\":null,\"Redirect\":{\"entryPoint\":\"https\"},\"Auth\":null,\"WhitelistSourceRange\":null,\"WhiteList\":null,\"Compress\":false,\"ProxyProtocol\":null,\"ForwardedHeaders\":{\"Insecure\":true,\"TrustedIPs\":null}},\"https\":{\"Address\":\":443\",\"TLS\":{\"MinVersion\":\"\",\"CipherSuites\":null,\"Certificates\":[],\"ClientCAFiles\":null,\"ClientCA\":{\"Files\":null,\"Optional\":false},\"DefaultCertificate\":null,\"SniStrict\":false},\"Redirect\":null,\"Auth\":null,\"WhitelistSourceRange\":null,\"WhiteList\":null,\"Compress\":false,\"ProxyProtocol\":null,\"ForwardedHeaders\":{\"Insecure\":true,\"TrustedIPs\":null}},\"traefik\":{\"Address\":\":8080\",\"TLS\":{\"MinVersion\":\"\",\"CipherSuites\":null,\"Certificates\":[],\"ClientCAFiles\":null,\"ClientCA\":{\"Files\":null,\"Optional\":false},\"DefaultCertificate\":null,\"SniStrict\":false},\"Redirect\":null,\"Auth\":null,\"WhitelistSourceRange\":null,\"WhiteList\":null,\"Compress\":false,\"ProxyProtocol\":null,\"ForwardedHeaders\":{\"Insecure\":true,\"TrustedIPs\":null}}},\"Cluster\":null,\"Constraints\":[],\"ACME\":{\"Email\":\"test@traefik.io\",\"Domains\":null,\"Storage\":\"/tmp/acme.json\",\"StorageFile\":\"\",\"OnDemand\":false,\"OnHostRule\":true,\"CAServer\":\"https://172.17.0.3:14000/dir\",\"EntryPoint\":\"https\",\"KeyType\":\"\",\"DNSChallenge\":null,\"HTTPChallenge\":{\"EntryPoint\":\"http\"},\"TLSChallenge\":null,\"DNSProvider\":\"\",\"DelayDontCheckDNS\":0,\"ACMELogging\":true,\"OverrideCertificates\":false,\"TLSConfig\":null},\"DefaultEntryPoints\":[\"http\",\"https\"],\"ProvidersThrottleDuration\":2000000000,\"MaxIdleConnsPerHost\":200,\"IdleTimeout\":0,\"InsecureSkipVerify\":false,\"RootCAs\":null,\"Retry\":null,\"HealthCheck\":{\"Interval\":30000000000},\"RespondingTimeouts\":null,\"ForwardingTimeouts\":null,\"AllowMinWeightZero\":false,\"Web\":null,\"Docker\":null,\"File\":{\"Watch\":true,\"Filename\":\"\",\"Constraints\":null,\"Trace\":false,\"TemplateVersion\":0,\"DebugLogGeneratedTemplate\":false,\"Directory\":\"\",\"TraefikFile\":\"/go/src/github.com/containous/traefik/integration/fixtures/acme/acme_base.toml218962287\"},\"Marathon\":null,\"Consul\":null,\"ConsulCatalog\":null,\"Etcd\":null,\"Zookeeper\":null,\"Boltdb\":null,\"Kubernetes\":null,\"Mesos\":null,\"Eureka\":null,\"ECS\":null,\"Rancher\":null,\"DynamoDB\":null,\"ServiceFabric\":null,\"Rest\":null,\"API\":{\"EntryPoint\":\"traefik\",\"Dashboard\":true,\"Debug\":false,\"CurrentConfigurations\":null,\"Statistics\":null,\"DashboardAssets\":null},\"Metrics\":null,\"Ping\":null,\"HostResolver\":null}"

Motivation

Fix a regression from #3386

More

• Added/updated tests

[juliens]

LGTM

[nmengin]

LGTM

[dtomcej]

LGTM