[BUG] network operator fails because of invalid proxy config

[praveenkumar]

NoProxy is []string type for ProxyConfig struct and we are directly using it with %s which is causing issue for different operators.

$  ./crc status --log-level debug
DEBU HTTP-PROXY: http://proxy-user1:xxx@ec2-xxxx:3128, HTTPS-PROXY: http://proxy-user1:xxx@ec2-xxxx.com:3128, NO-PROXY: [127.0.0.1 localhost .testing] 
DEBU Unexpected operator status for insights: Disabled 
DEBU network operator is degraded, Reason: InvalidProxyConfig 
DEBU About to run SSH command:
df -B1 --output=size,used,target /sysroot | tail -1 
DEBU SSH cmd err, output: <nil>: 32719437824 8936333312 /sysroot 
CRC VM:          Running
OpenShift:       Stopped
Disk Usage:      8.936GB of 32.72GB (Inside the CRC VM)
Cache Usage:     30.93GB
Cache Directory: /Users/prkumar/.crc/cache