mgr: set public-addr flag for MGR
mgr: set public-addr flag for MGR

This fixes that the MGR is binding to the gateway IP instead of the
actual Pod IP, as seen in #3136.
When hostNetwork: true is set the public-addrr is not set so custom
network configs can be used.

Signed-off-by: Alexander Trost <88b6b84d9fa0dbf878e34ae3d402bc4895fcd37e@googlemail.com>

rook/rook,rook/nfs,rook/rook,rook/rook,rook/nfs,rook/rook,rook/rook,rook/nfs