This commit provides an initial migration of general testing CI
infrastructure to CircleCI.

It uses CircleCI 2.1 paramereterised jobs to provide two base
configurations: a vm based `test-machine`, and docker based
`test-container`.

Jobs that require root, docker, or other similar features require the
machine based jobs, but others should be ran using the `test-container` package
as they are both cheaper and faster to run.

make: always honor GO_TAGS in dev

GOTEST_PKG_EXCLUDE overrides GOTEST_PKG entirely, so having both in
the same test run isn't supported and results in a whole lot of extra
tests being run.

Host Volumes Support: Rollup Edition

This adds an initial implementation of ACLs for HostVolumes.

Because HostVolumes are a cluster-wide resource, they cannot be tied to
a namespace, thus here we allow similar wildcard definitions based on
their names, tied to a set of capabilities.

Initially, the only available capabilities are deny, or mount. These
may be extended in the future to allow read-fs, mount-readonly and
similar capabilities.

Co-Authored-By: Mahmood Ali <mahmood@hashicorp.com>

* jobspec: breakup parse.go into smaller files

* add sidecar_task parsing to jobspec and api

* jobspec: combine service parsing logic for task and group service stanzas

* api: use slice of ConsulUpstream values instead of pointers

The command and command/agent packages are taking 5+ minutes on Travis
and this contributes to build timeouts. While this doesn't address
underlying issues, breaking these out can reduce re-runs until that
work is done.

Add field "kind" to task for use in connect tasks

Revert CNI auto-download 

This reverts commit 0bd157cc.

This reverts commit 54ce4d1f.

This fixes the recent allocation rows to navigate when clicking within them
rather than just on the link, which matches the cursor behaviour.