[SR-1174] [llbuild] Properly escape verbose command descriptions

[ddunbar]

Previous ID	SR-1174
Radar	None
Original Reporter	@ddunbar
Type	Bug
Status	Resolved
Resolution	Done

Additional Detail from JIRA

Votes	0
Component/s	llbuild
Labels	Bug, StarterBug
Assignee	@aciidb0mb3r
Priority	Medium

md5: 9e2bc2a22e36a68f65cc008d340149b7

Issue Description:

llbuild has a number of places where it prints out a command line to the console. When doing so, we should quote the command such that it will execute properly if rerun from the shell, which requires performing shell escaping.

For example:

$ cat t.llbuild 
client:
  name: basic
  version: 0

targets:
  "": ["<dummy>"]

commands:
  C.dummy:
    tool: shell
    args: ["echo", "hello \"world\"!"]
    outputs: ["<dummy>"]

$ llbuild buildsystem build --no-db -f t.llbuild 
echo "hello "world"!"
hello "world"!

The first command printed there echo "hello "world"!" is not escaped properly.

[aciidgh]

#29