install: Clean up some shell style: use here-docs, and compact getopt.
install: Clean up some shell style: use here-docs, and compact getopt.

eeshangarg/zulip,rishig/zulip,tommyip/zulip,hackerkid/zulip,andersk/zulip,punchagan/zulip,shubhamdhama/zulip,rht/zulip,eeshangarg/zulip,zulip/zulip,timabbott/zulip,shubhamdhama/zulip,shubhamdhama/zulip,rishig/zulip,dhcrzf/zulip,punchagan/zulip,showell/zulip,synicalsyntax/zulip,kou/zulip,dhcrzf/zulip,brainwane/zulip,jackrzhang/zulip,tommyip/zulip,shubhamdhama/zulip,kou/zulip,punchagan/zulip,zulip/zulip,jackrzhang/zulip,andersk/zulip,dhcrzf/zulip,kou/zulip,showell/zulip,synicalsyntax/zulip,synicalsyntax/zulip,showell/zulip,jackrzhang/zulip,eeshangarg/zulip,zulip/zulip,showell/zulip,synicalsyntax/zulip,rht/zulip,timabbott/zulip,showell/zulip,brainwane/zulip,eeshangarg/zulip,tommyip/zulip,andersk/zulip,hackerkid/zulip,jackrzhang/zulip,rishig/zulip,synicalsyntax/zulip,timabbott/zulip,rht/zulip,zulip/zulip,hackerkid/zulip,shubhamdhama/zulip,synicalsyntax/zulip,rht/zulip,rishig/zulip,hackerkid/zulip,punchagan/zulip,rht/zulip,timabbott/zulip,dhcrzf/zulip,kou/zulip,eeshangarg/zulip,shubhamdhama/zulip,dhcrzf/zulip,jackrzhang/zulip,hackerkid/zulip,andersk/zulip,eeshangarg/zulip,brainwane/zulip,timabbott/zulip,brainwane/zulip,tommyip/zulip,rishig/zulip,rishig/zulip,showell/zulip,brainwane/zulip,dhcrzf/zulip,shubhamdhama/zulip,kou/zulip,kou/zulip,zulip/zulip,brainwane/zulip,dhcrzf/zulip,andersk/zulip,jackrzhang/zulip,rht/zulip,hackerkid/zulip,punchagan/zulip,tommyip/zulip,hackerkid/zulip,andersk/zulip,punchagan/zulip,brainwane/zulip,zulip/zulip,kou/zulip,showell/zulip,synicalsyntax/zulip,andersk/zulip,timabbott/zulip,rishig/zulip,jackrzhang/zulip,zulip/zulip,eeshangarg/zulip,rht/zulip,timabbott/zulip,punchagan/zulip,tommyip/zulip,tommyip/zulip