Removed the -s flag and added a -k flag to read
from the file. Also did a bit of refactoring to
be able to reuse more code.
Check for the `LOGPLEX_NODE_NAME` variable and 
connect to it rather then the local node if it is
set. This is mostly used for testing.
Added a CT test for the replace shard e-script.
Removed the fold over nodes from `logplex_shard`.