Print advanced instructions after ghpc deploy

[mr0re1]

• Print advanced instructions after ghpc deploy;
• Change WriteDeployment to take deploymentDirectory;
• Meet test coverage by reducing number of lines.

[tpdownes]

I see the following issues from user side:

1. The instructions appear to be printed twice now when running create:

To deploy your infrastructure please run:

./ghpc deploy simple

Find instructions for cleanly destroying infrastructure and advanced manual
deployment instructions at:

simple/instructions.txt
To deploy your infrastructure please run:

./ghpc deploy simple

Find instructions for cleanly destroying infrastructure and advanced manual
deployment instructions at:

simple/instructions.txt

2. I think some space or another delimiter (e.g. ####) is necessary when running deploy:

collecting terraform outputs from simple/first
writing outputs artifact from group first to file simple/.ghpc/artifacts/first_outputs.tfvars
Find instructions for cleanly destroying infrastructure and advanced manual
deployment instructions at:

simple/instructions.txt

[tpdownes]

After you make the requested changes, please also update the description to include a "before" and "after" of what the commands look like.

[mr0re1]

$ make && rm -rf hello/ && ./ghpc create tst.yaml $TOOLKIT_DEF_VARS > ~/tmp/after
$ g co develop
$ make && rm -rf hello/ && ./ghpc create tst.yaml $TOOLKIT_DEF_VARS > ~/tmp/before
$ diff ~/tmp/after ~/tmp/before
$ # no diff

$ make && ./ghpc deploy hello > ~/tmp/after
$ g co develop
$ make && ./ghpc deploy hello > ~/tmp/before
$ diff ~/tmp/after ~/tmp/before
<
< ###############################
< Find instructions for cleanly destroying infrastructure and advanced manual
< deployment instructions at:
<
< hello/instructions.txt