nodetool won't work with TLS distribution as the erlang vm args
don't get passed in to escript. This commit reads the TLS args from
the vm.args file if it exists and prefixes the call to escript with
them.
The only way to have this work properly is to alias the command rather
than store it as a variable

basho/riak#509

Commit 44a4f19 uses $(command) notation
to populate SSL_ARGS. This notation is not supported by Solaris10 sh.

Use backticks instead.

Ksh expands aliases containing '=' differently from bash, but seems
to work fine when an alias is evaluated inside backticks. Call NODETOOL
inside backticks consistently throughout the file.

As other functions depend on ping_node() returning the exit code
from NODETOOL, but CLI users expect to see the stdout output, capture
the exit code before echoing the command output.

* Update runner

* Remove underscores so attach node is named properly