When the module support was added, cluster-grow was missed on the
client side. This has been added.
The parsing of the --instance options was also consolidated
so that cluster-create and cluster-grow receive the same
options.
Partial Bug: #1578917
Co-Authored-By: Matt Van Dijk <mvandijk@tesora.com>
Change-Id: I9a73a8c81f31d80e13ce7030d35cd2b087defbf3