sap_maintain_etc_hosts: Change space to tab delimiter

[marcelmamula]

Problem

sap_install_media_detect currently updates /etc/hosts file with spaces, creating usable but unsightly output.
Example of first line overwritten by role, while second line is kept unchanged.

10.10.10.170 je1scs.aws.com je1scs
10.10.10.138    je1ers.aws.com      je1ers

Solution

Change from space to Tab \t as already done in https://github.com/sap-linuxlab/community.sap_infrastructure/blob/0e67afc14738c8731192ef9f5040496c4a96e9b1/roles/sap_vm_provision/tasks/common/set_etc_hosts.yml#L24

@berndfinger @rhmk