Support network-uri split in bootstrap.sh

(cherry picked from commit ef9f6b41bebd4b8f1256f09c0eb83a09e471bae8)

Conflicts:
	cabal-install/bootstrap.sh
Use network-2.6.0.2 in bootstrap.sh

(cherry picked from commit 502b45405b7e2f15e0a96008e0283e11d68ccb47)

Conflicts:
	cabal-install/bootstrap.sh
Fix bootstrap.sh network-uri logic

(cherry picked from commit 4a26123ac1a3ccb5f383d8cf0f00ecf00d114468)

Conflicts:
	cabal-install/bootstrap.sh