fix(provider/init): check local cert expiration

[andy108369]

Tested:

# kubectl -n akash-services logs akash-provider-0 -c init --tail=100 -f
...
+ openssl x509 -checkend 604800 -noout -in /config/provider.pem
+ rc=1
+ [[ 1 -ne 0 ]]
+ echo 'Certificate expires in less than 7 days, so going to generate a new one.'
+ GEN_NEW_CERT=0
Certificate expires in less than 7 days, so going to generate a new one.
Removing the old certificate before generating a new one
+ [[ 0 -eq 0 ]]
+ echo 'Removing the old certificate before generating a new one'
+ rm -vf /config/provider.pem
removed '/config/provider.pem'
Generating new provider certificate
+ echo 'Generating new provider certificate'
+ provider-services tx cert generate server provider.akash.pro
+ echo 'Publishing new provider certificate'
+ provider-services tx cert publish server
Publishing new provider certificate
{"height":"15082307","txhash":"EDB72062C4162B107907FA7C4AAD47944DD187715011A78942473BDAE737CD69","codespace":"","code":0,REDACTED

2nd run:

+ openssl x509 -checkend 604800 -noout -in /config/provider.pem
+ rc=0
+ [[ 0 -ne 0 ]]
+ [[ 1 -eq 0 ]]