Refactor driver CLI

[outcatcher]

Changes

Remove deprecated flags

Change some default values including az,image, volume type

Remove k8s-related security group creation

Assure all env vars is prefixed with OS_

Change default env var for otc-subnet-id to OS_NETWORK_ID

Acceptance tests

=== RUN   TestDriver_SetConfigFromFlags
--- PASS: TestDriver_SetConfigFromFlags (0.00s)
=== RUN   TestDriver_Auth
--- PASS: TestDriver_Auth (2.15s)
=== RUN   TestDriver_Auth/default
    --- PASS: TestDriver_Auth/default (0.56s)
=== RUN   TestDriver_Auth/credentis
    --- PASS: TestDriver_Auth/credentis (0.46s)
=== RUN   TestDriver_Auth/ak/sk
    --- PASS: TestDriver_Auth/ak/sk (1.13s)
=== RUN   TestDriver_AuthCreds
--- PASS: TestDriver_AuthCreds (0.43s)
=== RUN   TestDriver_AuthAKSK
--- PASS: TestDriver_AuthAKSK (0.40s)
=== RUN   TestDriver_Create
--- PASS: TestDriver_Create (221.93s)
=== RUN   TestDriver_Create/default
    --- PASS: TestDriver_Create/default (107.29s)
=== RUN   TestDriver_Create/ak/sk
    --- PASS: TestDriver_Create/ak/sk (114.64s)
=== RUN   TestDriver_Start
--- PASS: TestDriver_Start (187.68s)
=== RUN   TestDriver_CreateWithExistingSecGroups
--- PASS: TestDriver_CreateWithExistingSecGroups (103.73s)
=== RUN   TestDriver_ExistingSSHKey
--- PASS: TestDriver_ExistingSSHKey (98.85s)
=== RUN   TestDriver_WithoutFloatingIP
--- PASS: TestDriver_WithoutFloatingIP (110.88s)
=== RUN   TestDriver_CreateWithUserData
--- PASS: TestDriver_CreateWithUserData (108.10s)
=== RUN   TestDriver_UserDataRaw
--- PASS: TestDriver_UserDataRaw (0.90s)
=== RUN   TestDriver_ResolveServerGroup
--- PASS: TestDriver_ResolveServerGroup (3.93s)
=== RUN   TestDriver_FaultyRemove
--- PASS: TestDriver_FaultyRemove (5.30s)
PASS

Process finished with exit code 0

[outcatcher]

recheck

[otc-zuul[bot]]

Build succeeded.

• golangci-lint : SUCCESS in 1m 42s
• golang-make-vet : SUCCESS in 1m 43s
• golang-make-functional : FAILURE in 1m 58s (non-voting)
• goreleaser-build : SUCCESS in 4m 09s