Add http(s) protocol support to fetch_review and list_reviews

It allows to use git review -d/-m/-x/-N/-X over http(s) and allows
to enable/disable ssl certificate check using http.sslVerify git
option or GIT_SSL_NO_VERIFY environment variable.

Note: it requires REST API support on gerrit side.

Change-Id: Ic0bd846607c62c5403a3393dcbccbcec432bd51d
Closes-Bug: #1290268
Merge "Add http(s) protocol support to fetch_review and list_reviews"